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Transcript

00:00:00 Have you ever taken a moment to think about the exciting secrets of today's daily life on planet Earth?

00:00:07 We are talking about small doors in washing machines and small holes in the windows of airplanes.

00:00:13 If you have no idea what we are talking about, let yourself be surprised and you will discover a lot of things.

00:00:22 You see this drawer under your oven? Maybe you have ignored it from the beginning or you used it to store pans and pans.

00:00:30 Well, even if it can actually serve as a storage space, it is not its only function.

00:00:36 The best way to use this drawer is to keep your meal hot while you wait to serve it. Great, isn't it?

00:00:43 Speaking of secret spaces, did you notice that most washing machines also had small folding doors at the bottom?

00:00:51 These doors are actually used as evacuation hatches.

00:00:54 This is where all the stuff we put to wash with our jeans and jackets goes.

00:00:58 It's a kind of collector of small intruders.

00:01:02 It prevents them from reaching the evacuation pipes and blocking them.

00:01:06 This saves hundreds of euros in repair each month.

00:01:10 Now, who has not had the hard task of having to measure the exact amount of spaghetti to cook per person?

00:01:19 Here is the solution, the hole in the middle of the pasta spoon.

00:01:23 It is there to measure the exact amount of dry pasta you need for a person.

00:01:28 On a similar subject, have you ever wondered why the pens' caps had a hole?

00:01:34 You may have thought it was a technical feature used to regulate air pressure.

00:01:40 But in reality, this hole has a much simpler and more important function.

00:01:46 Reduce the risk of suffocation.

00:01:49 Many people like to bite their pen caps, and this tiny hole prevents them from suffocating,

00:01:54 in case they accidentally swallow the cap and it gets stuck in their throat.

00:01:59 For cooking amateurs, there is a hidden secret under your nose that can change your life.

00:02:05 Think of the pan. Now, think of their wrists.

00:02:09 Yes, they also have a hole, and it turns out that this hole was designed to accommodate the spoon you use to cook.

00:02:16 And instead of pouring sauce all over the kitchen or the floor of your kitchen,

00:02:21 you can put the spoon in the hole when it still drips with sauce.

00:02:25 Speaking of everyday objects, most of the door handles are made of brass,

00:02:30 because this material naturally makes them anti-sebum.

00:02:33 Unlike your plastic salt, brass door handles are somehow magical.

00:02:38 They can disinfect themselves without you having to clean them.

00:02:41 Have you ever noticed that under a meter, there was a small hole?

00:02:45 You can find it in the metal part on which you have to pull to measure something.

00:02:50 Well, this hole is actually the exact size of an ordinary nail.

00:02:55 It was designed so that you can hang the meter on top of a nail to hold it while you measure.

00:03:01 As for the margins of your notebook, they were invented to protect the pages from the dirty.

00:03:06 No, they didn't copy people's answers during math exams,

00:03:10 but it was a time when people had to live with rats and mice who often dirty the paper.

00:03:16 So, to prevent information from being lost completely, we created the margins.

00:03:21 In this way, the texts were concentrated in the middle of the pages and remained unnoticed by the dirty.

00:03:28 It may be from this that, through expression, an information is digested.

00:03:32 And what about these tiny holes at the bottom of the plane windows?

00:03:36 They have an extremely important function, to regulate the air pressure inside the cabin.

00:03:42 In other words, they help planes fly high in the sky.

00:03:46 Pretty important, isn't it?

00:03:48 In fact, the airplane's tablets are the most germ-infected places in the entire cabin.

00:03:54 Studies have shown that these tablets contained eight times more germs than the toilet water pump.

00:04:00 And now, what would you say to cut a commercial plane in half and see what's inside?

00:04:06 Well, it would look more or less like this.

00:04:09 Rows of seats at the top and everything that has to be stored at the bottom.

00:04:13 We are talking about passengers' luggage, emergency supplies, parts of the wing system, and so on.

00:04:20 Well, let's move on to bowling balls, even if the transition is a bit brutal.

00:04:24 Have you ever wondered what the inside of a bowling ball looks like?

00:04:28 If you cut a professional ball in half, you will see a familiar shape.

00:04:32 Look closely, can you see it?

00:04:34 Doesn't it look like the logo of Sympa?

00:04:37 Anyway, professional bowling balls are different from those of your local bowling.

00:04:43 It's because they are designed to make more precise movements.

00:04:46 They actually have a very complex engineering inside.

00:04:49 They are designed to help pros to make more strikes.

00:04:53 The weight of professional bowling balls is designed to be projected inwards when they move on the bowling track.

00:05:00 It would therefore be more difficult for them to be in the tracks next to the track.

00:05:05 While we're on the subject of bowling balls, let's take a look inside a baseball bat.

00:05:10 To make it light and aerodynamic, the manufacturers use several different layers.

00:05:15 Starting from the core, we have a center in black rubber-wrapped alloy.

00:05:20 Then there is a layer of red rubber, followed by two or three layers of wool thread.

00:05:26 After that, there is a white leather cover, very visible,

00:05:29 and this magnificent red seam on the side that unites it all.

00:05:33 If you had a vision with X-rays and you managed to look inside a human bone,

00:05:39 what is most striking is this structure that looks like a spider's web in the center of the bone.

00:05:45 In reality, it's a very condensed and complex structure of nerves that you have inside your bones.

00:05:51 Now, a riddle.

00:05:54 What is round, that we find near the ocean, and that looks like an aerial view of the Guggenheim Museum in New York,

00:06:00 which is almost entirely made of ramps?

00:06:03 If you answered a shell of a nautilus, then you guessed right.

00:06:07 A nautilus is a shell that you can find at home in countless souvenir shops near the beach.

00:06:13 It is made up of two layers, an outer layer of a matte white and an inner layer of a iridescent white.

00:06:20 And if you had to cut it in half, it would look a lot like the Guggenheim Museum.

00:06:25 Aloe vera leaves are excellent for healing and also for hydration.

00:06:31 But if you managed to look inside an aloe leaf,

00:06:34 the image you would see would be as satisfying as relaxing.

00:06:38 Who has never dreamed of a pool filled with jam?

00:06:41 There seems to be nothing more banal than a toothpaste tube.

00:06:46 But you would change your mind if you cut a tube that contains several colors.

00:06:50 There have been speculations that the inside of such a tube could be divided by barriers,

00:06:55 so that the bands do not mix.

00:06:58 But if you cut it in half, you will see that it has only one inner space.

00:07:02 It turns out that a complex science is behind the manufacture of the toothpaste.

00:07:07 According to a specialist, it is necessary to ensure that all stripes have the same physical properties.

00:07:12 In this way, colors are naturally prevented from mixing with each other.

00:07:17 That's why if you cut a tube, you will see something that looks like several slices of pizza of different colors.

00:07:23 Now, if you open your closet, you will find at least a few wooden belts.

00:07:29 They are generally made of cedar wood, which is a natural repulsive against mites.

00:07:34 For some people, the eyeliner is an essential part of their daily life.

00:07:39 But did you know that in ancient Egypt, men and women wore gauze to protect their eyes from the sun's glow?

00:07:47 Normally, we use headbands to, well, rest our heads, right?

00:07:53 Not only that, it turns out that headbands can be easily removed from seats and used to break car windows in case of emergency.

00:08:02 Very few people know the following trick.

00:08:05 You probably place your headband in the width, like most of us.

00:08:09 But headbands are designed to absorb the dirt from the soles of your shoes before you go home.

00:08:15 So, to make it work as it is supposed to, the best way to place a headband is in length.

00:08:21 This way, you will take more steps on the headband before going home.

00:08:26 And finally, you probably vacuumed in the wrong way, and we can prove it.

00:08:32 Most people are happy to vacuum the floors and carpets in one direction,

00:08:37 or to move the brush back and forth several times, thinking they have eliminated all the dust.

00:08:42 But according to cleaning professionals, the best way to vacuum is in rows.

00:08:47 First, you move forward with the brush until you reach the end of the row.

00:08:52 Then you sweep the carpet and go down the same row,

00:08:56 picking up the dust that was not collected during the first sweeping.

00:09:00 Or, if you don't want to disturb the dust, you can just sweep the room with a single glance.

00:09:07 This is probably not what you imagine when you think of cashews,

00:09:12 but a Reddit member found them like this in a store in Brazil.

00:09:16 In fact, they are not real nuts.

00:09:19 Cashew nuts grow at the end of a cashew apple.

00:09:22 There is a special word for a fruit with a seed inside, a "drop".

00:09:28 Cashew nuts are therefore drops, just like almonds and pistachios.

00:09:32 Brazil is the homeland of cashew nuts.

00:09:35 The tree was then brought to India by the Portuguese in the middle of the 16th century.

00:09:39 From there, it spread to Asia, then to West Africa.

00:09:43 Today, these regions are the largest producers of cashew nuts,

00:09:47 but the United States is the largest consumer.

00:09:50 They import 90% of global crops.

00:09:53 Speaking of food, here are some interesting facts.

00:09:56 Did you know that pineapples grow this way?

00:09:59 In addition, they are not part of these fruits that grow fast.

00:10:02 It takes them between 16 and 24 months before they can be harvested.

00:10:07 Not to mention that a plant can only produce 3 pineapples at most during its life.

00:10:12 Fun fact, each segment of a pineapple was once a flower.

00:10:16 Have you ever wondered why eggplant is called "eggplant" in English,

00:10:20 that is, "plant oeuf"?

00:10:22 If you've never seen a grown eggplant, here's a picture.

00:10:25 Now you understand.

00:10:27 It literally looks like eggs that are growing.

00:10:30 In addition, eggplant is not a botanical vegetable.

00:10:34 They are berries, just like watermelons.

00:10:36 In fact, eggplant is not always purple.

00:10:39 They can also be white, green or even purple with white stripes.

00:10:44 You'll never guess what it is.

00:10:46 It looks like a bouquet of flowers, but it's broccoli that hasn't been harvested.

00:10:50 These flowers are actually edible.

00:10:53 Broccoli has been known for at least 2,000 years.

00:10:55 It was the Romans' favorite food.

00:10:57 But it only appeared in North America in the 1920s.

00:11:01 It was brought to California by Italian immigrants who began selling it.

00:11:06 Today, the United States is the third largest producer of broccoli after China and India.

00:11:12 And here's what an artichoke becomes if you let it bloom.

00:11:16 An artichoke is actually a flower that hasn't had time to bloom.

00:11:20 It's also one of the oldest foods humans know.

00:11:23 Do you remember that a pineapple takes about two years to produce fruits,

00:11:27 and that a plant can only carry three pineapples in its lifetime?

00:11:31 Well, an artichoke plant can grow up to 20 artichokes a year.

00:11:35 Artichokes are one of the healthiest vegetables in terms of antioxidants.

00:11:39 Here's a picture of a sleeping turtle.

00:11:42 Many of them sleep inside their shells to protect themselves from predators.

00:11:46 But some turtles can't retract in their shells,

00:11:50 so they sleep in positions similar to these.

00:11:53 These animals are active during the day and sleep at night.

00:11:56 The amount of sleep a turtle needs depends on the species.

00:12:00 It can range from 10 hours to one.

00:12:03 On average, a turtle takes a nap every 4 to 6 hours.

00:12:07 The most important factor for a turtle when it goes to sleep is to find a safe place.

00:12:12 They can hide under leaves or in holes in the ground.

00:12:16 Have you ever seen a chameleon's feet?

00:12:18 These creatures have two toes on the inside of their feet

00:12:21 and three on the outside, at the level of the front feet.

00:12:25 And it's the opposite for the back feet.

00:12:27 Chameleons live on trees, and their feet help them climb better.

00:12:32 We all know that chameleons have a unique ability to change colour.

00:12:36 But they don't change it to hide.

00:12:39 In reality, colour depends on the chameleon's mood, temperature, humidity and light.

00:12:45 And did you know that some of them have a tongue that is twice as long as their body?

00:12:51 Have you ever seen a walnut's mouth up close?

00:12:53 They have teeth inside their beaks.

00:12:56 Walnuts are very loyal creatures.

00:12:59 It's not a myth that a walnut attaches to the first stimulus it sees after an explosion,

00:13:05 no matter if it's a walnut, a person or even a simple object.

00:13:09 It will remain devoted to this creature or this lucky thing throughout its life.

00:13:14 Walnuts also mate for life, and they are very protective of their offspring.

00:13:19 If they lose a loved one, they cry for it.

00:13:22 If a walnut from a group falls ill or is injured,

00:13:25 two or three stay with it to protect and care for it.

00:13:28 This adorable little creature is a newborn alligator.

00:13:31 But don't be fooled by its cute appearance.

00:13:34 This little fellow is already about 60 years old.

00:13:37 It's not the DNA that determines the sex of an alligator, it's the temperature.

00:13:41 If the eggs were laid when it was hot, bad alligators will hatch.

00:13:46 If they stay in colder temperatures, there will be a lot of females.

00:13:51 After hatching, it takes 10 years for an alligator to become an adult.

00:13:55 Alligators generally live about 35 years in the wild.

00:13:59 In fact, alligators cannot live in salt water, unlike crocodiles,

00:14:04 because they do not have a special gland to excrete the salt from their bodies.

00:14:08 Here is a newborn pigeon.

00:14:10 You have probably seen thousands of pigeons in your life, but probably never a newborn.

00:14:15 It's because newborn pigeons stay in the nest for about 6 weeks,

00:14:19 which is longer than any other bird.

00:14:22 When they come out of the nest, they look almost like adult pigeons.

00:14:26 No wonder you never noticed the difference.

00:14:29 In addition, they are probably the first domesticated birds by man,

00:14:33 and they are experts in navigation.

00:14:36 They can find their way home at a distance of 2,000 km,

00:14:40 which is more than the distance between New York and Florida.

00:14:44 We think that pigeons have an innate sense of direction.

00:14:47 In ancient times, mail was distributed by traveling pigeons.

00:14:52 This is the mouth of a cow.

00:14:54 These brushes are called "papillconics".

00:14:57 They help the cow to move food in its mouth.

00:15:00 Cows have a field of vision of 330 degrees,

00:15:03 so there are few things that can escape their attention.

00:15:06 You remember that some turtles need only one hour of sleep a day.

00:15:10 Cows sleep even less, about 30 minutes a day.

00:15:14 And this time is divided into 6 to 10 short periods of deep sleep.

00:15:19 These animals stay in a lying position for about 10 hours a day,

00:15:23 but the rest of the time they move, covering long distances,

00:15:27 and they drink about 100 liters of water a day.

00:15:30 Can you guess what it is?

00:15:32 It's sand that has grown 300 times.

00:15:34 The sand is broken rock in micro pieces

00:15:37 after being eroded for millions of years.

00:15:40 Microbial communities live on each grain of sand.

00:15:43 Things can get really tiny in this world.

00:15:46 Even if there is a lot of it on Earth,

00:15:48 sand remains a precious material.

00:15:50 Concrete is made from this material,

00:15:53 and some countries, like the United Arab Emirates and Singapore,

00:15:56 have imported tons of sand to expand their territory by creating artificial islands.

00:16:02 Apparently, this is what the sinuses look like.

00:16:05 These are hollow spaces in the water of your face,

00:16:08 behind the forehead, the nose, the cheekbones and between the eyes.

00:16:12 They are very important because they produce mucus,

00:16:15 which is a fluid in your nose that filters, warms up and moisturizes the air you breathe.

00:16:20 The sinuses also help you detect tastes.

00:16:23 Without this ability, the food would be much less tasty.

00:16:26 Here is the inside of a bowling ball.

00:16:29 You can see that it is not symmetrical,

00:16:31 so the weight is not evenly distributed.

00:16:34 This allows the ball to have curved trajectories.

00:16:37 Did you know that bowling appeared 5,000 years ago in ancient Egypt?

00:16:41 Yes, it is not a new sport, and it was popular all over the world.

00:16:45 But the rules and equipment were different everywhere.

00:16:49 The first bowling alley was built only in the 19th century in New York.

00:16:53 What is here is a Barbapapa that has been forgotten.

00:16:57 Conclusion, do not forget it,

00:16:59 otherwise it will shrink as if it never existed.

00:17:02 Barbapapa is made up of only two ingredients,

00:17:05 colored sugar and air.

00:17:08 So we now know the only ingredient in the world that is,

00:17:11 so far, free, air.

00:17:14 In addition, a thread of Barbapapa is thinner than a hair.

00:17:18 By the way, December 7 is Barbapapa Day.

00:17:22 Mark this day in your calendar for next year.

00:17:25 With only two ingredients, this candy does not contain fat.

00:17:29 In addition, it was created by a candy maker and a dentist.

00:17:33 You are trying on a jean, a dress or a jacket,

00:17:36 and you are about to put your hand in the pocket,

00:17:39 when suddenly you realize that it is impossible.

00:17:42 There is no pocket at all.

00:17:44 But why sew pockets in which you can not put anything?

00:17:48 You can now pick up your iPhone on the ground.

00:17:52 Well, the reason is very simple.

00:17:55 Adding pockets on some clothes could harm the cut that was initially given to them.

00:18:00 They can deform them in the warehouse or on the detailer's showcase.

00:18:05 The solution? Get rid of pockets in key places.

00:18:09 In addition, fake pockets cost much less and they do not distance themselves.

00:18:14 This curious practice dates back to the 17th century.

00:18:18 At that time, pockets were removable.

00:18:21 They were like small bags and women, for example, could pass them from one outfit to another.

00:18:26 Unfortunately, it was also very practical for pickpockets.

00:18:30 Nothing easier than grabbing your pockets.

00:18:33 Then, clothes evolved.

00:18:36 And we started sewing thin pockets instead of these detachable bags.

00:18:41 We thought it embellished the silhouette.

00:18:45 But soon, narrower skirts appeared.

00:18:48 And pockets were caught.

00:18:51 People started using handbags instead.

00:18:54 Today, most pockets are real.

00:18:56 But the fake ones have not completely disappeared.

00:18:59 So, how do we make sure that our clothes have pockets and that we will not find a simple hole by putting our hand in it?

00:19:05 First, take a look at the seam along the edge of the pocket, where it is supposed to open.

00:19:11 If you see a single loose thread, cut a piece and start pulling gently.

00:19:16 If the pocket is real, the thread will come out easily.

00:19:20 But if the seam does not move, it is very likely that it is a fake pocket.

00:19:26 In this case, drop it.

00:19:29 Now, let's see what other everyday objects have a little secret.

00:19:34 For example, these lines on some varieties of crisps.

00:19:38 They help to distribute spices and seasonings.

00:19:42 Basically, all these substances that give your crisps their taste are retained between these lines.

00:19:48 And then, they make them more crispy.

00:19:52 The overliners are filled with a semi-transparent fluorescent ink that shines under low light.

00:19:58 Yellow and light green are the most popular, because they allow you to see the text when you make a black and white photocopy.

00:20:06 The photocopiers do not detect these colors and the page remains clear.

00:20:12 In the past, there was a problem with jeans.

00:20:16 The workers and miners who were the first to wear them often mistreated them during their work.

00:20:22 And the seams did not resist and tore.

00:20:26 Tiny metal rivets were therefore added to reinforce this popular garment.

00:20:32 Most metal zipper locks lock automatically.

00:20:35 That's why you should not leave the zipper pointed up.

00:20:38 When you bring it down, it locks, in a way.

00:20:42 This is thanks to small grooves hidden under the zipper.

00:20:46 Now let's talk about these horizontal lines on plastic bottles.

00:20:51 It is thanks to them that the bottles stand up.

00:20:54 Some bottles are made of flexible plastic.

00:20:56 Without these lines, they would deform.

00:20:58 They would be all twisted and could even break.

00:21:01 The bath foam is not only used to have fun or to perfume the water.

00:21:05 It is also used to regulate the temperature.

00:21:07 The bubbles retain the heat and you can enjoy your bath longer.

00:21:10 With or without plastic ducks.

00:21:14 Have you noticed this layer of transparent liquid in gel-based pencils?

00:21:18 This is what is called the "follow-up liquid" or the "stop liquid".

00:21:21 The gel of these pencils contains dissolved pigment particles in a polymer solution.

00:21:26 The gel must be thick enough to hold the particles in suspension.

00:21:29 But also fluid enough to flow first on the ball, then on the paper.

00:21:34 The stop liquid prevents the gel from evaporating or flowing.

00:21:40 Without this transparent fluid, your gel-based pencil would not write.

00:21:45 The fluid is fixed and does not dissolve with the gel.

00:21:49 It does not move backwards and does not flow from the pen.

00:21:53 The holes at the bottom of your headphones allow the air to circulate and pass through the speakers.

00:21:59 This increases the low frequencies, which improves the quality of low sounds.

00:22:03 And the sound quality in general is improved.

00:22:06 Some plastic milk containers have holes on the sides.

00:22:10 It's because they keep hitting each other.

00:22:15 These holes have several functions.

00:22:17 First of all, when the milk stops, it usually causes a swelling and an increase in pressure inside the container.

00:22:26 This is when the hole is useful.

00:22:28 It inflates and prevents the container from bursting.

00:22:31 In addition, if you decide to freeze your milk, it will spread like any other liquid.

00:22:36 And this hole will inflate and your bottle of milk will remain intact in your freezer.

00:22:41 A good thing!

00:22:44 The airplane's wings have rounded edges and this is very important for safety.

00:22:48 This avoids accidents.

00:22:51 The weak points are generally located in the corners.

00:22:54 If the plane's wings were square or rectangular, they would therefore have four weak points.

00:22:59 With the pressure, it could be catastrophic.

00:23:03 If you look closely at the air cables of the landing gear, you will see that they zigzag instead of running in a straight line.

00:23:11 All landing gear has pantographs on their roofs.

00:23:15 The upper part of the pantograph gradually wears out at the contact of the cable.

00:23:20 And in the end, it must be replaced.

00:23:23 To make it wear out evenly, the cables do not follow a straight line, but in a zigzag.

00:23:29 The landing gear moves forward and its pantograph wears out more slowly.

00:23:36 You may have already wondered why some gas cans have two holes with caps, a large and a smaller one.

00:23:42 Before, I thought the small hole was used to pour the liquid into a small container.

00:23:47 But I was wrong.

00:23:49 And it's very rare.

00:23:51 In fact, you have to uncap it before pouring your gas into the big hole.

00:23:55 You will avoid it from "glugluglut" and spreading on the ground by accident.

00:24:00 Most of the buttonholes of a shirt are vertical.

00:24:04 But those at the top, and sometimes at the bottom, are horizontal.

00:24:08 The reason is simple. These two buttons slide more often than the others.

00:24:12 Fortunately, the manufacturers have found a solution to prevent these buttons from sliding.

00:24:16 Horizontal buttonholes. What ingenuity!

00:24:20 The buttons are less often found in this type of buttonhole.

00:24:24 Sugar or salt bags are easier to open than you think.

00:24:28 You don't have to tear off one of the ends.

00:24:31 The right method is to tear them in the middle.

00:24:35 Some boots have loops on the top of the heel.

00:24:38 They are used to make it easier to put on your shoes.

00:24:41 You just have to pull on the loop while you put your heel in the boot.

00:24:45 You can also use these loops to hang your shoes when they are dirty or when you want to dry them after washing.

00:24:51 You can also put your laces through the loop if you want to tie them around your ankle.

00:24:56 When you are on a plane, you may notice a small triangle above your seat.

00:25:01 These triangles indicate to the flight staff the best places to check the flights of the plane through the canopy.

00:25:06 You are never too safe.

00:25:08 If your shoes are really too slippery, you just need to take some sandpaper and rub it on your soles.

00:25:14 They will stick better and you can wear them when it rains.

00:25:18 But be careful not to sand them too much.

00:25:21 Your feet could get wet.

00:25:25 If you drill a few holes in the bottom of your trash can, it will be easier for you to place and take out your bags.

00:25:31 The air will circulate better and will not hold them back.

00:25:35 You will usually find silicon gel in your bags, shoes and many other things you buy.

00:25:41 This gel absorbs excess humidity.

00:25:44 Do not throw away your bags.

00:25:46 Every time your shoes are wet, put a few of them inside.

00:25:50 Thermos were not invented to keep your coffee hot.

00:25:54 They were designed by a Scottish scientist who wanted to keep his chemicals at a stable temperature.

00:26:00 So he took two bottles, put the smallest inside the largest and removed the air between the two.

00:26:06 But it's still convenient for picnics.

00:26:11 Have you ever wondered what these extra holes at the top of your sports shoes are for?

00:26:16 They are designed so that you can attach your shoes in several different ways.

00:26:20 It's useful when you want to compensate for things like a bad stripe or even a damaged toe.

00:26:27 In addition, you can modify the look of your shoes as you wish.

00:26:33 Many people use the cover of their books as a page marker.

00:26:37 This is not a problem. Thanks to it, you will not have to frame your pages.

00:26:41 But the first goal of a cover is to protect the book against external damage.

00:26:45 For example, if you spill fruit juice or if you drop food on your book while you read it.

00:26:52 The tic-tac box has this little groove on top so that you can distribute a single tic-tac at a time.

00:26:59 Even if, let's be honest, no one does that.

00:27:02 Most of us spill a lot of it at once.

00:27:04 Then we put all these tic-tacs back in the box.

00:27:09 These little rubber tips that you see between the tire treads are there for your safety.

00:27:13 They tell you what is the minimum height of your tread.

00:27:17 If the tips and edges are equal, it's time for you to go to a tire shop as soon as possible.

00:27:23 But if the wear witnesses still have room, compared to the edges, you can ride quietly.

00:27:29 What is this black grill on the microwave window?

00:27:32 This is what is called a Faraday cage.

00:27:35 And it is there to prevent microwaves from escaping and to turn the whole room into an oven.

00:27:41 If the microwaves escape, your meal will not be able to cook properly either.

00:27:45 Indeed, this cage is not there to prevent you from seeing your meal while it is cooking.

00:27:49 But so that the electromagnetic energy stays inside.

00:27:55 And why not a screwdriver compatible with a wrench?

00:27:58 You can screw your screwdriver with the end of your wrench to increase its torsion force.

00:28:02 That's why the head of your screwdriver is designed as it is.

00:28:05 When you have weird angles, you can use this strategy.

00:28:10 You've probably heard this myth.

00:28:12 The blue side of the eraser can erase the pen.

00:28:15 It's wrong. Its purpose is also to erase the pencil.

00:28:18 But in case you write something on a more robust paper.

00:28:21 The blue side can also remove these traces that may remain after using the pink eraser.

00:28:27 Have you ever wondered why oranges in supermarkets are most often in red mesh bags?

00:28:32 It's a tip for the fruits to be a brighter color, which encourages you to buy them.

00:28:37 A bonus tip, do not throw this bag in the trash.

00:28:40 Tie it to have enough to cook your pans and clean your sink, your kitchen appliances and your dishes.

00:28:48 You can see that golf balls do not have a perfectly round shape.

00:28:52 Their surface is covered with many small pockets, which golf balls have not always had.

00:28:57 At one point, experienced golfers began to notice that over time,

00:29:01 old balls with imperfections, such as notches and bumps, could fly further.

00:29:07 These roughness creates turbulence in the air around the golf ball, which ends up reducing its drag.

00:29:14 Manufacturers have therefore started to produce balls with pockets, so that they can go further and faster.

00:29:21 You may have noticed that there were sometimes small cracks on the top of the toothpicks.

00:29:25 It's more hygienic, because when you break it, you can press the toothpick on it and it will not touch anything else.

00:29:31 Another safety device that you will find in your car this time is a strap on your rearview mirror.

00:29:40 With it, you can change the position of the mirror, so as not to be blinded if there is a car behind you driving in the headlights.

00:29:47 This little strap helps you control the blinding of the lights coming from the rear.

00:29:51 This function appeared in the 1930s, but it was not until the early 1970s that it became a standard equipment for most cars and other trucks.

00:30:00 Do you see this little hole on your iPhone, right next to the rear-facing camera?

00:30:06 It's a microphone. And it's there so that your phone can record the sound when you rotate your camera.

00:30:13 Some cables have a thick cylinder at the end of the cord. This is called a ferrite core.

00:30:19 It is a magnetic iron oxide that stops electromagnetic interference at high frequencies.

00:30:25 You see, for example, this annoying static noise you get if you bring your phone too close to a speaker.

00:30:31 It interferes with your call. This is why cable cords with large cylinders are rather useful, because they prevent this kind of thing.

00:30:41 Do you know why almost all luggage and backpack bags have two zippers?

00:30:45 It's much more practical and easier to open it that way.

00:30:48 But that's not all. You can also lock these two sliding zippers together so that the things inside your bags are safe.

00:30:55 You know how public places' toilets, like shopping centers, have these large spaces at the bottom of the door?

00:31:01 It's mainly for better air circulation.

00:31:05 These types of doors also make it easier to clean the toilets or check if they are occupied when you wait.

00:31:11 Apart from that, if you're stuck inside and the lock is broken, you can always escape. You can just crawl out.

00:31:20 Have you ever noticed these plastic tips on the cutters?

00:31:24 The blade is also curved, which means you can renew it several times, always with sharp edges.

00:31:32 You can separate these pieces of blade with these plastic tips.

00:31:35 Then you just have to move the sliding part to push this new blade forward.

00:31:40 If you've ever taken a moment to look at a supermarket's box, in particular its foldable section, you've probably noticed these metal loops that protrude.

00:31:49 They are designed to protect the items you carry in your box.

00:31:53 You can use them to hang bags containing soft items, like bread, which you don't want to accidentally crush with heavier products.

00:32:01 Or things that are more easily broken, like eggs.

00:32:04 Many coffee cups have curved notches on their bottom.

00:32:09 When you wash your cups, place them against the drawer of your dishwasher.

00:32:13 This way, water won't accumulate inside and your favorite cup will be completely dry when you take it out of here.

00:32:20 If you're a fan of McFlurry, you've probably noticed that there was a square hole in the handle of their spoon.

00:32:28 It's there so you can attach it to this special machine that mixes the ice cream with your favorite toppings.

00:32:33 The machine has a bar that slides into this square-shaped spoon and that carefully stirs it.

00:32:39 And you get this spoon to minimize damage during the process.

00:32:44 Pretty cool, isn't it?

00:32:46 An ordinary milk can usually has a boss on the side.

00:32:51 Some may see a random design choice, but this boss fulfills several objectives.

00:32:57 One of them is to inflate if there's an accumulation of gas.

00:33:00 This happens when your milk has turned.

00:33:03 This way, you don't even need to taste it to check.

00:33:06 In addition, the boss is there so that the bottle doesn't explode if you drop it accidentally.

00:33:10 It allows an expansion space that takes in the sudden pressure that occurs when you drop the bottle.

00:33:16 The dental floss.

00:33:19 It's obviously important to take care of your teeth, and it's easy to guess how to use it.

00:33:25 It's great in the kitchen, because it's a very precise cake cutter.

00:33:29 Much more efficient than an ordinary knife.

00:33:32 Most kitchen scissors have a dental opening right here in the middle, where the blades and handles meet.

00:33:40 It's something you can use to trim down difficult herbs like thyme or rosemary.

00:33:45 Thanks to this opening, you don't need to remove the leaves by hand, but you can tear them all in one move.

00:33:54 Most yogurt or flan jars come with an aluminum foil lid.

00:33:58 In most cases, you can use this lid as a disposable spoon.

00:34:03 Just take it off, and after a few simple folds, you'll have a perfect little spoon for your 4-hour meal.

00:34:10 If you see it in the street, you think a fire hose is about 1 meter high.

00:34:16 But the actual size of this device, used to supply water to firefighters around the world, is twice as big.

00:34:23 If you count the rest of the fire hose that's hidden underground.

00:34:26 Most of the time, they're red. And it's not just a matter of urban design.

00:34:30 First of all, they have to be bright and easily identifiable, so that firefighters can locate them quickly if needed.

00:34:36 In the U.S., the choice of color depends on the amount of water the fire hose can contain.

00:34:40 It can sometimes vary depending on the location, but here's the logic.

00:34:44 A red fire hose can project 1,890 liters of water per minute, while an orange one can project at least 3,780 liters.

00:34:53 Green ones can project 5,680 liters of water per minute, and the biggest ones, blue ones, can generally provide more than 5,680 liters.

00:35:02 Hey, bowling fans! It's not that bad that your bowling ball is cracking.

00:35:06 It turns out that most of them can break because of poor storage or temperature spikes.

00:35:11 Now, let's be honest. Since it's already a bit broken, you're not curious to know what's inside your ball?

00:35:19 Because I am. Let's take a look. The ball's internal core is mainly made up of powder metallic oxides, like calcium oxide or iron.

00:35:27 They're mixed with resin and a catalyst to harden the whole thing.

00:35:31 So, the ball's inside form is actually its heaviest part. It also influences the way the bowling ball spins when it crosses the track.

00:35:40 The same goes for paint bombs. When you shake it, it makes a weird noise.

00:35:46 But what's this thing inside? It's a small weight, which is supposed to keep the paint mixture in place and keep its shape.

00:35:52 It's generally made of plastic, metal or ceramic. It's mainly used as a wheel to make sure the paint is well mixed before applying it to the surface of your choice.

00:36:01 Have you ever wondered how the bottles of sparkling water keep this sparkling and refreshing smell for so long?

00:36:07 Well, they have a small plastic seal attached to the lid. It's installed here to prevent the gas from escaping and the drink from becoming flat.

00:36:15 Even if you shake it all day long.

00:36:17 Speaking of things you use when it's really hot. Wait, wait, don't put on your cap yet.

00:36:24 Look at it for a moment and you'll notice there's a little button at the top.

00:36:28 It's for something or it's just there to look pretty.

00:36:31 Some say that when people started using such things to cover their heads, this button was really useful.

00:36:39 It's located above the cap, where all the pieces of fabric meet. The upper button keeps the crown of the cap in one piece.

00:36:45 Today, thanks to recent projects on fabric design and patterns, this button has become an aesthetic element.

00:36:51 It's used to cover the part where all the pieces of fabric meet.

00:36:54 Your cap may not have a button, but you don't think it's cooler with one?

00:36:58 Cotton discs have two sides. And if you take the time to look at them carefully, you'll see that they have different textures.

00:37:07 That's why the side with the texture is for putting on makeup, and the flat side is for removing it.

00:37:12 Book lovers, this is for you.

00:37:16 The jackets that come with many books with a rigid cover are not only intended to embellish the book.

00:37:20 They can also serve as a bookmark.

00:37:23 Just fold the pages you've already read under the inside of the jacket, and that's it.

00:37:27 The next time you take your favorite shirt, take a look at the buttonhole at the top.

00:37:32 It must be sewn horizontally, while all the others are vertical.

00:37:36 It turns out that the city shirt was designed this way, since the first and last button are the first to unbutton during the day.

00:37:43 They therefore modified the meaning of the buttonhole so that the shirt stays well adjusted before you're ready to take it off.

00:37:50 Nowadays, we have so many different versions of this incredible dessert that it's hard to imagine that we could have lived without it.

00:37:57 You can find different types of chocolate chip cookies everywhere, in ice cream or even in cakes.

00:38:04 This famous cookie was born in 1930.

00:38:07 The story goes that a woman named Ruth Grave Wakefield was preparing chocolate chip cookies while waiting for her guests.

00:38:14 Very quickly, she realized that she didn't have any more chocolate left from the bakery.

00:38:18 An essential ingredient to prepare classic cookies.

00:38:21 To remedy this situation, she bought a half-sweet chocolate bar, thinking that it would end up evenly distributed in the dough, given the heat of the oven.

00:38:28 Things didn't necessarily go as she had planned.

00:38:32 So she invented this modern dessert that we can't live without anymore.

00:38:35 And speaking of popular snacks, chips are even younger than chocolate chip cookies.

00:38:42 At least from a historical point of view.

00:38:44 There are many stories that try to explain how they were invented.

00:38:48 One of them is the following.

00:38:50 A chef named George Crum, based in New York, created chips in 1953.

00:38:55 He wanted to try a new cooking method when one of his customers was full of his fries.

00:39:02 He said they were too thick and a little soft.

00:39:05 Crum then imagined finely sliced and fried potatoes until they were brown.

00:39:10 People loved this dish and welcomed this very first batch of chips in Bresouvers.

00:39:15 Ice cream, anyone?

00:39:19 If the story is true, in 1904, at the Saint Louis Universal Exhibition, an ice cream vendor ran out of ice cream to serve his specialty.

00:39:27 He made a cone-shaped waffle, and the rest is now part of history.

00:39:31 Okay, I admit it, similar products to chewing gum have existed since ancient Greece.

00:39:36 So this discovery is not particularly revolutionary.

00:39:39 But the chewing gum we buy today appeared at the end of the 1800s.

00:39:44 An American inventor named Thomas Adams wanted to mix different chemical products to create synthetic rubber.

00:39:50 He tried, and failed, to exploit the properties of gum for his experiment.

00:39:56 But he ended up creating this delicious snack.

00:39:58 Today, we still use gum to produce a certain number of chewing gums.

00:40:02 In the 1800s, a man named Jean-Baptiste Joly worked in the textile industry as a fabric manufacturer.

00:40:08 The discovery of the following invention, which we use a lot nowadays, has a little to do with him and more to do with his wife.

00:40:15 The story goes that the woman had accidentally thrown a kerosene lamp on a tablecloth.

00:40:21 Instead of getting angry when seeing the damaged fabric, Joly noticed that the substance had actually cleaned the fabric.

00:40:27 You already understood? Yes, that's how the very first pressing came about.

00:40:32 A very clean accident, if I may.

00:40:36 Now, I love this one. Did you know that the lights were originally called "Friction Lights"?

00:40:42 In any case, it is the name that their inventor, a chemist named John Walker, gave them in 1826.

00:40:49 One day, he scratched a chemical-made stick on his chimney by pure chance, and realized that it was on fire and created sparks.

00:40:57 Originally made of cardboard, they were then made from wooden rods and glass paper.

00:41:03 In the 1940s, a man named Harry Coover came across a chemical formula that seemed to adhere to everything it touched.

00:41:11 The scientific community at the time did not think much about the question, because the formula did not seem to have much application at the time.

00:41:19 It was only in 1951 that he looked a little more at the formula and decided to reuse it.

00:41:24 With another researcher, Distman Kodak, named Fred Joyner.

00:41:28 They used a complete name, "Methyl Sionacrylate Adhesive Composition", but you must know it under the shorter version, "Superglue".

00:41:36 It is so popular in terms of safety today that it is difficult to believe that we did not invent it on purpose.

00:41:42 In 1903, a scientist named Edward Benedictus dropped a bottle by accident.

00:41:48 Looking down, he was amazed to see that the bottle had slightly melted, but had retained its shape.

00:41:54 He expected it to break into a thousand pieces.

00:41:57 Intrigued by this unknown peculiarity until then, he pondered the question and discovered that what kept the glass in place was a substance, nitrate of cellulose, which covered the inside of the glass.

00:42:08 This is how humanity discovered the glass of safety.

00:42:12 There is nothing better than a slice of toast with butter for breakfast, except for sundaes with melted caramel.

00:42:18 If you find it difficult to spread your cold butter on your bread, here is an idea.

00:42:23 Use a cheese grater, but on the side the amount of butter you need and grate it.

00:42:28 This way, the amount of butter needed will soften and it will be easier to spread.

00:42:34 But still, the melted caramel.

00:42:38 There are different shapes and sizes of dry pasta for a reason.

00:42:42 Each type of pasta is perfectly matched with a certain type of sauce.

00:42:46 Conchiglioni, for example, are perfect with a denser and thicker sauce.

00:42:52 Why? Because the sauce enters the shells and makes the dish easier to serve.

00:42:58 The stripes on the surface of the pasta allow you to retain the sauce.

00:43:04 If you ever burn your biscuits, oh no!

00:43:07 You can get them back with your favorite cheese grater.

00:43:10 Just grate the burnt parts once the biscuits have been removed from the baking tray.

00:43:14 But be careful, wait until they have cooled down.

00:43:17 If ever, by removing the burnt part, you abate them a little, just dip them in melted chocolate.

00:43:23 Once the chocolate hardens, you will have perfect biscuits.

00:43:27 But let's be honest, does the shape of the biscuit really matter at the time of tasting?

00:43:33 I'm just saying, I'm not saying anything.

00:43:35 If you make sandwiches with lots of ingredients, but you don't want the bread to be soft,

00:43:42 there is a technique to prevent this from happening.

00:43:45 Take the tomatoes or cucumbers you want to put in your sandwich

00:43:49 and place them between two paper towels for 5 minutes.

00:43:52 There you go, you can put them in the bread.

00:43:54 Make sure to spread the butter, cheese or sauces like mayo or ketchup first on the bread.

00:44:00 This will seal the bread and prevent it from softening.

00:44:04 Some people think that you have to remove this little white filament

00:44:08 which is next to the egg yolk before cooking it.

00:44:11 I'm here to tell you that these filaments are called shallots.

00:44:15 And there is no need to get rid of it.

00:44:17 They are there to hold the yolk in place in the center of the egg.

00:44:21 Shallots have no impact on the consistency and taste of your food.

00:44:25 It's up to you to see if you want to remove them or not.

00:44:29 Have you ever noticed that the juice bricks have two tabs on the sides?

00:44:32 These are actually handles.

00:44:35 The manufacturers designed these bricks in this way

00:44:39 so that we can handle them more easily without crushing them and taking the juice out.

00:44:44 You don't need to be a star chef to know that you can use white sugar or brown sugar in all your recipes.

00:44:52 Have you ever wondered what the difference was between the two?

00:44:56 The only thing that makes them different is the way they are produced.

00:44:59 A small amount of molasses is added to the cassonade.

00:45:04 Molasses is a kind of syrup obtained during the sugar cane transformation.

00:45:10 It is what is removed during the process of refining.

00:45:12 This is how white sugar is produced.

00:45:15 But if a certain amount of molasses remains in the final product,

00:45:18 we get cassonade, which has a stronger taste and a darker color.

00:45:23 It's a good thing.

00:45:26 You can put a lot of things in your dishwasher.

00:45:28 Not just plates and cutlery.

00:45:30 For example, you can wash your kitchen gloves in silicone,

00:45:34 the pommels of some household appliances, such as those in your oven or your cooking plate.

00:45:38 Some sponges and other reusable towels can also be washed in the dishwasher.

00:45:43 Speaking of household products for the kitchen, you can do a lot with the dishwasher.

00:45:49 You can clean your garden furniture, for example,

00:45:53 add a little dishwasher liquid to hot water

00:45:55 and use this mixture to rub all your garden furniture with a piece of fabric.

00:45:59 Rinse them with your watering pipe.

00:46:02 You can also use your dishwasher to remove the grease stains from your clothes.

00:46:07 The stains from pasta sauce, salad seasoning.

00:46:10 Hey, we all happen to miss our mouth.

00:46:13 Put a little dishwasher liquid on the stain and rinse with water.

00:46:16 For light clothes, it is better to use non-colored liquid.

00:46:21 For the most tenacious tasks, let the dishwasher work for a few minutes,

00:46:24 then put the clothes in the machine as usual.

00:46:27 And maybe buy a bottle too.

00:46:29 If you still haven't found a technique that suits you to organize your wardrobe

00:46:33 and you are overwhelmed by piles of clothes,

00:46:35 there is a simple trick that might work.

00:46:38 It's the one-of-a-kind technique.

00:46:41 For each piece of clothing you buy, you have to get rid of an old piece of clothing.

00:46:47 You will regularly unpack your wardrobe.

00:46:51 To find things more easily, good luck,

00:46:54 leave the clothes you use most often at eye level.

00:46:57 You can find them more easily and get them out of the wardrobe quickly.

00:47:00 Clothes you use less often, like evening clothes for example,

00:47:04 can be stored under or above your eye level.

00:47:08 Old, tin boxes can be very useful.

00:47:12 If you glue very powerful magnets inside,

00:47:15 they can serve as magnetic containers.

00:47:19 You can store a lot of objects, like kitchen pliers,

00:47:22 ice spoons or even cutlery.

00:47:25 You can place them on any metallic surface,

00:47:29 like the door of your fridge.

00:47:31 They will go very well with the rest of your magnets.

00:47:33 At the bottom of your laundry, you have an essential tool to collect animal hair.

00:47:39 It even works better than adhesive rollers.

00:47:41 These are dryer wipes.

00:47:43 One of these wipes and a little elbow grease and you're done.

00:47:48 You can find a dryer everywhere.

00:47:49 It works on all surfaces,

00:47:51 but it's particularly effective on cluttered furniture.

00:47:54 If you don't want your doors to squeak every time you enter a room,

00:47:58 take a soap and rub it directly on the hinges.

00:48:02 It only works for a short time,

00:48:04 but it will do until you go to a DIY store.

00:48:07 To buy lubricant, for example.

00:48:10 You have already noticed that in some elevators,

00:48:13 there is a star next to such or such floor.

00:48:17 And no, it's not made to indicate the floor of my office.

00:48:19 It is used to indicate the closest exit.

00:48:23 And it's not always on the first floor.

00:48:25 It is rather on the floor closest to the street.

00:48:28 Have you ever wondered why the stop signs are red?

00:48:32 Some time ago, there were no specific colors.

00:48:36 Before 1920, there were not even standard shapes.

00:48:40 In 1922, someone had the idea to impose the octagon.

00:48:46 But at first, these signs were yellow.

00:48:48 The red faded too quickly because of exposure to the sun.

00:48:51 Yellow was the best option.

00:48:55 It was only 30 years later that the more resistant enamel paint was invented.

00:49:00 It was then that the color of the stop signs became red.

00:49:03 After all, it's the best color if you want something to be easily spotted.

00:49:08 Did you know that there is a type of rosebush that grows taller than a man?

00:49:15 According to the Guinness Book of Records, the tallest rosebush that has ever existed is in Vienna.

00:49:20 And it measures more than 8.5 meters high.

00:49:24 Yes, this rosebush has dared.

00:49:26 Like our digital footprints, which are unique, there are no tigers with the same stripes.

00:49:33 This is how people who work with these big felines distinguish them from each other.

00:49:38 I bet you didn't know that the White House has its own florist underground.

00:49:45 This business takes care of the ornaments for all the events organized at the White House.

00:49:49 We know that pizza has become a staple food of American cuisine, despite its Italian origins.

00:49:57 This dish is so appreciated that Americans buy 350 pieces of pizza every second.

00:50:03 Personally, I think I don't eat enough.

00:50:09 To meet the incredible demand, about 17% of all restaurants in the United States are pizzerias.

00:50:15 There is a technique to make lemonade without the lemon seeds getting in your glass.

00:50:22 Cut the fruit in half and try to squeeze it with kitchen tweezers.

00:50:26 The pointed part of half the lemon must be placed down.

00:50:30 The juice will flow, but the seeds will remain in the lemon.

00:50:33 Mmm, lemonade.

00:50:35 It's good with pizza.

00:50:37 The construction and workshop workers are usually dressed in orange, because this color is visible even in bad weather.

00:50:43 It is the most effective color to attract attention and alert people.

00:50:47 No wonder that many security vests and traffic lights are also orange.

00:50:52 The stop sign has an octagonal shape to help drivers recognize it easily, even if they see it from behind.

00:50:58 And when the signs were not yet reflective, the octagonal shape prevented drivers from confusing the stop sign with the traffic lights.

00:51:06 The rough bands on the sides of the road are placed there to alert drivers who are getting on the steering wheel.

00:51:12 When the tires pass on these bands, the noise and vibrations work like an alarm clock.

00:51:17 There are magnetic locks on the fuel pumps in gas stations, in case someone leaves with the gasoline gun still attached to his tank.

00:51:26 In this case, the lock automatically detaches the pipe.

00:51:29 The gasoline forms a rainbow in a puddle of water, because it cannot mix with water.

00:51:35 It forms a thin membrane on top.

00:51:38 When the light reflects on it and on the water at the same time, you get a rainbow.

00:51:43 The triple handle of a jerry can is there to allow two people to carry it more easily and to distribute the liquid evenly.

00:51:51 Gasoline cans often have a second hole that must also be unlocked before pouring the liquid.

00:51:56 Air passage will prevent it from overflowing and therefore from wasting.

00:52:02 Most gasoline cans have two holes with caps, one larger and one smaller.

00:52:06 You are supposed to unlock the smallest hole before pouring the liquid into the largest one.

00:52:10 This will prevent the liquid from overflowing and from spreading on your clothes and on the floor.

00:52:15 Another little thing that we often neglect is the tip of a cap of a lipstick.

00:52:20 Most tubes are usually sealed with a plastic film or an aluminum sheet, and opening it with your nails is not the best idea.

00:52:28 The tip of the cap allows you to easily open even the most tightly sealed tube.

00:52:32 You can use most screwdrivers with a wrench to create more torque.

00:52:37 Just place the wrench on the handle of the screwdriver.

00:52:40 This way, you will need to apply much less force than usual.

00:52:44 You will also be able to reach more easily difficult areas of access.

00:52:48 Cameras are installed in stores, banks and hospitals to monitor everything.

00:52:53 If something happens, you can call the police or the rescue.

00:52:57 Cameras help to resolve a lot of cases.

00:52:59 So why are there no cameras in airplanes?

00:53:02 The crew keeps order in the plane, but they can't do anything if something serious happens.

00:53:07 In addition, there is nowhere to hide in an airplane.

00:53:10 During the flight, cameras are useless, and after the flight, the passengers' testimonials work as well as cameras.

00:53:17 So if cameras are useless, why spend money on them?

00:53:23 Water is very easy to clean because it has triangular molecules,

00:53:27 composed of an oxygen atom and two hydrogen atoms, hence the H2O.

00:53:32 These molecules have slightly different discharges on their opposite sides, a bit like magnets.

00:53:37 This is why water easily attaches to other molecules, including those that make up saline.

00:53:42 Many individual houses have triangular roofs,

00:53:46 because it allows rain, snow and dead leaves to slide on the slope.

00:53:51 If you hang a roof over your house, it could collapse one day.

00:53:54 When a storm approaches, clouds seem to become dark.

00:53:58 But it's only an illusion.

00:54:00 The thin clouds of a sunny day easily let the light through.

00:54:03 They also diffuse all the colors of the light spectrum.

00:54:06 This makes us perceive clouds as being white.

00:54:09 The thicker the clouds are and contain droplets of water,

00:54:12 the less they let the light through and the darker they appear.

00:54:16 A good number of doors are made of brass, bronze or some alloys of copper.

00:54:21 These metals have an antigen effect.

00:54:23 Bacteria spread much more slowly on them.

00:54:26 They also get rid of microbes quite quickly, in a few hours.

00:54:30 But that doesn't mean you shouldn't wash your hands.

00:54:33 Diamonds have symmetrical shapes to show you their brilliance.

00:54:37 At first, these precious stones are not so beautiful.

00:54:40 They go through several stages of size and then become pieces of elegance.

00:54:45 Most of these stones have a round shape with slightly pointed corners.

00:54:49 It is in this shape that diamonds shine the most.

00:54:52 Why are there two holes in an electric socket?

00:54:55 The left hole is negatively charged, the right hole is positively charged.

00:54:59 And the space below is the ground.

00:55:01 Electricity must flow through the circuit.

00:55:04 The current goes through the positive hole, through the charger of your phone, for example,

00:55:09 then passes through the negative hole.

00:55:11 Have you ever wondered what your jeans pocket was for?

00:55:14 People used to wear watches to tickle.

00:55:16 The small pocket was designed for this purpose.

00:55:19 Today, no one wears this kind of watch anymore, but the pocket has remained.

00:55:23 And you can slip small objects in there, like a ring.

00:55:26 In London, there are poles that look a bit like light bulbs, but they don't have bulbs.

00:55:31 Their official name is "smoking pipe" and they belong to history today.

00:55:36 But they were very useful in the 19th century.

00:55:40 These hollow poles evacuated the air and the smelly explosive gases to avoid, let's say, undesirable consequences.

00:55:47 Most kitchen scissors have metallic teeth that look like clamps in the middle between the handles.

00:55:54 They can help you break nuts, crab shells and other hard products.

00:55:58 You can also use them to open jars and bottles or remove the stems of herbs.

00:56:02 Leather often looks dull to the eye because it is covered with tiny scratches and scuffs.

00:56:09 They scatter the light that hits the material.

00:56:11 When you put on your shoes with a layer of wax, you fill these tiny crevasses.

00:56:15 The surface becomes smoother and the light rays bounce more uniformly.

00:56:20 This is why leather then takes a brighter shade.

00:56:23 The highlights are filled with a special fluorescent, semi-transparent ink that can shine in low light.

00:56:30 Yellow and light green shades are the most popular because they don't prevent you from seeing the text after a black and white photocopy.

00:56:37 Photocopiers perceive yellow and light green marks as very pale and don't print them.

00:56:41 We make horse-hair-shaped magnets because they increase the magnetic force.

00:56:46 Colors are also important.

00:56:49 The blue part indicates the south pole and the red part the north pole.

00:56:53 Both poles work simultaneously and increase the attraction force.

00:56:57 The 1 cm diameter hole in the doors of an elevator is a lock.

00:57:03 If the doors are locked, an operator can manually open them by inserting a special key into the hole.

00:57:08 As for the tiny holes in the airplane's windows, they are there to balance the air pressure.

00:57:14 The window is made up of three layers.

00:57:17 The exterior window is extremely solid.

00:57:19 It can withstand the air pressure difference during take-off and landing.

00:57:23 The interior window, which is the closest to you, is made of less expensive material.

00:57:28 It avoids any potential damage to the window.

00:57:32 The airlock itself is located in the central window.

00:57:34 It not only balances the pressure, but also avoids the window from jamming.

00:57:38 The mechanical stairs are there for your safety.

00:57:41 They prevent you from getting too close to the edge of the escalator.

00:57:44 This way, your clothes or laces won't get stuck between the steps.

00:57:48 You see the sun in yellow or orange because the atmosphere of our planet

00:57:52 is scattered with colors like blue, green and purple.

00:57:55 This is also why the sun looks warmer at sunrise and sunset.

00:58:01 If you go to a store to buy oranges, you'll probably find them in a red net.

00:58:05 It's pure marketing.

00:58:07 And this color is not a random choice.

00:58:10 When they are wrapped in a red net,

00:58:13 the oranges look more orange, more juicy and more attractive.

00:58:17 So you are more likely to buy them.

00:58:20 Lemons are generally sold in green net nets for the same reason.

00:58:24 If they were wrapped in red, they would look more orange.

00:58:28 Green goes better with yellow and makes the color of the lemons stand out more.

00:58:32 The manufacturers of nets produce a limited number of different nets.

00:58:36 And the only way to make them different is to invent a fantastic sewing pattern.

00:58:40 Two nets from two different companies can be of exactly the same quality,

00:58:44 but cost a different price.

00:58:46 Most people will never know this and will believe that different patterns

00:58:49 indicate a different quality.

00:58:51 So, when you buy, don't worry about the pattern.

00:58:55 Almost all hotels have white bed sheets.

00:58:57 They choose this color specifically to show how high their standards of cleanliness are.

00:59:02 The whiter the sheets are, the more the hotel looks high-end.

00:59:06 It is much easier to see dirt and stains on white laundry.

00:59:10 It's proof that your room has been made.

00:59:12 The seat belts of passenger seats have a fabric loop.

00:59:17 When it is subjected to a strong pressure, the loop tightens

00:59:21 and the excess fabric can cushion the passengers.

00:59:24 These extra few centimeters can make a big difference in the event of an accident.

00:59:28 But it is different on the driver's side.

00:59:31 As the driver is closer to the steering wheel,

00:59:34 he is more likely to not have this loop.

00:59:36 Seat belts were invented in the middle of the 19th century,

00:59:41 but they only really began to be used in the 1960s.

00:59:45 Pre-collision sensors have made the safety devices go to a higher level.

00:59:53 By predicting the collision of a car,

00:59:55 this technology allows the seat belts to tighten automatically,

00:59:59 open the airbags,

01:00:01 and trigger the brakes to reduce the impact.

01:00:04 Every year, 6 million car accidents occur in the United States.

01:00:08 This is why we must continue to develop safety devices,

01:00:12 not only to mitigate accidents,

01:00:14 but also to protect passengers more effectively.

01:00:20 The materials used to make the bodywork have only been replaced in the last 25 years,

01:00:25 from aluminum and magnesium alloys to carbon fiber composites.

01:00:30 These lighter materials not only save fuel,

01:00:34 but also guarantee that the bodywork offers a deformation zone.

01:00:38 When a car hits an object, this zone absorbs the impact energy.

01:00:44 But if this seems to cause more damage to the car,

01:00:49 it actually protects the passengers better.

01:00:51 Pre-collision sensors are very underrated,

01:00:54 and since we've been using them,

01:00:56 it's hard to imagine without them.

01:00:59 Pre-collision sensors were invented in the late 1800s.

01:01:03 They have evolved so much that we no longer realize that we have them.

01:01:07 But they are there, hidden under the exterior coatings,

01:01:10 made up of foam or compressible plastic,

01:01:13 surrounded by a reinforced bar.

01:01:17 The windows of your car are glass,

01:01:19 but the windshield is designed to be break-proof.

01:01:22 It is sheet metal,

01:01:24 so that whatever the impact,

01:01:26 no glass splatter is projected on the front seats.

01:01:29 Normal glass was used until the 1950s,

01:01:32 as vehicles evolved,

01:01:35 modifications were made to ensure more safety.

01:01:39 Airbags now seem to have always existed.

01:01:42 In fact, they were invented in 1968,

01:01:46 and were in advance of their time.

01:01:48 They then slowly gained popularity,

01:01:51 and eventually became mandatory on all cars

01:01:54 from 1998.

01:01:57 They have also evolved,

01:02:00 and are no longer limited to a simple airbag in the steering wheel.

01:02:03 Today, you can find them everywhere in the car,

01:02:06 to ensure the safety of all passengers.

01:02:09 Pre-collision sensors,

01:02:11 connected to an on-board computer,

01:02:14 detect the moment when a collision occurs

01:02:16 and trigger the airbags,

01:02:18 which inflate in a few milliseconds.

01:02:21 It can be difficult to anticipate the weather and the state of the roads.

01:02:25 At the end of the 1960s,

01:02:27 the ABS anti-skid system was put in place on cars.

01:02:31 Before, it was used on many aircraft,

01:02:36 whose design dates back to 1908.

01:02:39 It quickly became necessary on all vehicles,

01:02:43 thus ensuring better grip on slippery surfaces

01:02:46 and better control of the wheels during braking.

01:02:49 Today, the ABS has progressed so much

01:02:51 that the latest versions provide additional detection

01:02:54 in the event of strong wind.

01:02:56 The speed regulator, invented in 1948,

01:03:01 has not stopped evolving over the years.

01:03:03 Today, the adaptive speed regulator

01:03:06 means that when the car is driving at a constant speed

01:03:09 and detects a slower car in front of it,

01:03:12 it adapts its speed to that of the other car.

01:03:14 Other variants make sure that the car stops on its own

01:03:18 if the vehicle in front of it does the same.

01:03:21 It is easy to forget to turn on the lights

01:03:26 when driving for several hours.

01:03:28 Automatic lights are becoming more and more common.

01:03:31 Cameras determine the type of light in real time

01:03:36 and help determine whether or not the road lights should be turned on.

01:03:41 Although automatic lights have been around since the 1950s,

01:03:44 the old models used sensors that were sensitive to light

01:03:47 and were much less reliable.

01:03:49 New models can identify different sources of light,

01:03:52 whether it is the sun,

01:03:54 the direct light of a car coming in front of it,

01:03:56 or even the reflection of a panel,

01:03:58 which allows the lights to be adapted

01:04:00 and thus avoid disturbing other drivers.

01:04:02 It is sometimes difficult to make sure

01:04:04 that no one is in the famous blind spot,

01:04:08 which causes about 400,000 accidents a year in the USA.

01:04:11 The solar sensors located in the rear bumper

01:04:15 and the blind spot monitoring systems

01:04:18 monitor adjacent roads.

01:04:20 They alert the driver

01:04:22 if a vehicle is on the road next door,

01:04:24 whether by flashing lights on the dashboard

01:04:27 or by sound beeps, reducing the danger.

01:04:33 1.6 million road accidents are caused by the use of a mobile phone.

01:04:38 And fatigue is at least 10% of car accidents.

01:04:42 The driver's attention monitoring system

01:04:45 allows you to control all this.

01:04:47 It works thanks to sensors

01:04:49 that monitor the movements of the car

01:04:51 and the number of corrections in the steering

01:04:53 to ensure that the driver remains attentive.

01:04:55 When the on-board computer identifies

01:04:57 that the driver is not well awake

01:04:59 or that he is distracted by his phone,

01:05:02 it sends signals indicating that it is time to take a break.

01:05:04 Tires are one of the most critical parts of your car

01:05:08 and are closely related to the type of road you are driving.

01:05:11 Many safety devices depend on them.

01:05:15 This is why it is very important to ensure

01:05:18 that your tires are always in perfect condition.

01:05:20 The tire pressure monitoring system

01:05:23 checks the air pressure in the four tires

01:05:25 and tells you when to increase or decrease the pressure

01:05:28 to avoid any risk.

01:05:31 The constant evolution of technology

01:05:33 ensures that you are safe on long journeys.

01:05:36 The white line crossing sensors

01:05:38 focus on the marking on the road

01:05:40 and ensure that the car stays on its path.

01:05:43 If it deviates and approaches a non-blinking line,

01:05:46 a camera identifies it and sends a signal to the driver.

01:05:50 The lane assist function

01:05:53 follows the same method

01:05:55 to prevent the car from getting stuck on the adjacent lane.

01:05:58 If it gets too close,

01:06:00 it automatically adjusts the steering

01:06:01 to re-center the car on its path.

01:06:04 Even the most modern cars have autonomous driving options.

01:06:08 Automatic driving systems

01:06:10 have moved the speed regulator to the higher level,

01:06:13 allowing the vehicle to stay on its path

01:06:15 while maintaining its speed,

01:06:17 but also by changing lanes when necessary.

01:06:21 Some devices are gradually becoming more and more important

01:06:24 in all car models.

01:06:26 For example, night vision,

01:06:29 which uses thermographic cameras

01:06:30 to locate pedestrians and animals.

01:06:32 It integrates with the on-board computer

01:06:35 and identifies objects based on their thermal signature.

01:06:38 There are more than 1.4 billion cars in traffic around the world,

01:06:44 and as the world population is increasing,

01:06:46 we expect the number of cars to grow as well.

01:06:49 Safety devices are constantly evolving.

01:06:54 Infrared headlights

01:06:58 will soon be in poor visibility conditions,

01:07:00 such as storms, snow and fog.

01:07:02 They will improve driver visibility

01:07:05 in all conditions,

01:07:07 without affecting the view of other drivers.

01:07:09 Driver control systems

01:07:11 will soon be able to monitor

01:07:13 and identify these different behaviors.

01:07:15 Whether during reckless driving

01:07:17 or for other safety reasons,

01:07:19 cars will soon be able to take control themselves,

01:07:23 thus ensuring the safety of all passengers.

01:07:27 Increased-reality windshields,

01:07:28 which are in the process of being developed,

01:07:30 will allow certain elements of the dashboard

01:07:33 to be displayed on the windshield.

01:07:35 So, soon, all the most useful indications

01:07:38 will appear right in front of the driver

01:07:40 so that he will no longer lose sight of the road.

01:07:42 Airbags will no longer only be used inside the car,

01:07:47 but will also be activated outside the car

01:07:50 when they detect an imminent collision.

01:07:54 They will cover the entire surface of the car

01:07:56 to reduce the impact.

01:07:58 This technology could be so advanced

01:08:01 that the body would no longer need to be repaired.

01:08:04 Future technologies should be so advanced

01:08:07 that cars themselves will have their own forms of communication,

01:08:11 not with drivers,

01:08:13 but with other cars.

01:08:15 Imagine cars sharing information

01:08:18 when they identify roadblocks,

01:08:20 road problems or certain weather phenomena.

01:08:23 All this will guarantee the most efficient route

01:08:25 and a safer journey.

01:08:27 Have you ever been excited in your room

01:08:32 listening to some of your favorite songs

01:08:34 and admiring the bass sound of your speaker

01:08:37 while it's playing your tune

01:08:39 at high decibels?

01:08:41 And have you ever wondered

01:08:43 why this same speaker,

01:08:45 as well as so many other speakers around the world,

01:08:47 are almost always black?

01:08:49 Some of you are probably

01:08:52 looking at your screen right now

01:08:53 to say that your speakers are green, red

01:08:55 or any other color of the rainbow.

01:08:58 First, we said "almost always".

01:09:00 And then, if you look closely

01:09:02 at the magnificent design of your music player

01:09:04 in bright colors,

01:09:06 you will see that the speaker below

01:09:08 is still black.

01:09:10 One possible explanation for this

01:09:12 is that the original technology

01:09:14 had a diaphragm with black particles on it.

01:09:16 So as soon as a sound is amplified,

01:09:18 it sends a charge through the diaphragm

01:09:21 and the black particles are pushed up.

01:09:22 The carbon particles that bounce

01:09:24 and touch the upper membrane of the diaphragm

01:09:26 are responsible for the creation

01:09:28 of some of the distinct sounds

01:09:30 of our speakers that we love so much.

01:09:32 The speakers manufacturers

01:09:34 must have had enough

01:09:36 to see their products change color

01:09:38 in case of prolonged use

01:09:40 and to see these black particles

01:09:42 settle on the upper membrane of the diaphragm.

01:09:44 Their logical solution

01:09:46 was to color most of the speakers black.

01:09:50 Another practical reason

01:09:51 for which speakers are most often

01:09:53 colored black is that it is a color

01:09:55 that fits easily with many types of decor.

01:09:57 Walls, furniture and clothes

01:09:59 are often raised

01:10:01 when they are combined with this color.

01:10:03 That's why it is so widespread.

01:10:05 According to several studies,

01:10:07 listening to music has been ranked

01:10:09 several times in the top 10

01:10:11 of our favorite pastimes around the world.

01:10:13 Nowadays, we find speakers everywhere.

01:10:15 In your television,

01:10:17 your laptop and your computer,

01:10:19 your phone.

01:10:20 You can't escape them.

01:10:22 But let's take a look

01:10:24 at how it all started.

01:10:26 Their origins lie in the technology

01:10:28 of radio and telephone.

01:10:30 The first form of speaker

01:10:32 was developed by Johann Philipp Reis in 1861.

01:10:34 This German inventor

01:10:36 self-taught to install the speaker

01:10:38 on his phone.

01:10:40 He was just able to reproduce

01:10:42 clear tones,

01:10:44 but he could also reproduce

01:10:46 muffled words after a few revisions.

01:10:48 In 1867,

01:10:49 the inventor Graham Bell

01:10:51 decided to try to produce

01:10:53 an improved version of Reis' speaker.

01:10:55 Basically, Bell and other inventors

01:10:57 were looking to make an electro-dynamic speaker.

01:10:59 In 1877,

01:11:01 it still didn't exist,

01:11:03 but thanks to the desire of inventors

01:11:05 from all over the world to change that,

01:11:07 research has confirmed

01:11:09 that it was quite possible

01:11:11 to make one.

01:11:13 In particular, the work of Werner von Siemens,

01:11:15 who had the idea of a coiled electromagnetic speaker,

01:11:17 was the driving force

01:11:18 behind this conclusion.

01:11:20 Next question.

01:11:22 Why are there magnets in speakers?

01:11:24 Nowadays, all speakers

01:11:26 are powered by an electric current,

01:11:28 which inventors we have mentioned

01:11:30 would never have considered as acquired.

01:11:32 When this electric current changes,

01:11:34 it produces a magnetic field.

01:11:36 To move the speaker's panel,

01:11:38 magnets are used

01:11:40 to create an opposite magnetic field

01:11:42 that creates vibrations.

01:11:44 These vibrations are the sound

01:11:46 we end up hearing.

01:11:47 The bigger the magnet,

01:11:49 the louder the speaker.

01:11:51 Another American inventor,

01:11:53 Thomas Edison,

01:11:55 had filed a patent in the United Kingdom

01:11:57 for a system using compressed air

01:11:59 in an amplification mechanism.

01:12:01 The first commercial electric speaker

01:12:03 was only born in 1924.

01:12:05 The sound produced by this speaker

01:12:07 was good enough for cinema.

01:12:09 It took nearly 20 years

01:12:11 to get to the next breakthrough.

01:12:14 This was the arrival

01:12:15 of the duplex driver in 1943.

01:12:17 It offered greater clarity

01:12:19 and better coherence

01:12:21 to high volumes,

01:12:23 which was important

01:12:25 in cinemas.

01:12:27 This is why it was nicknamed

01:12:29 "the voice of cinema".

01:12:31 The duplex driver was immediately tested

01:12:33 by the Academy of Arts and Sciences of Cinema

01:12:35 and became the norm

01:12:37 of the film industry in 1955.

01:12:39 This concept of a speaker

01:12:41 is still in use today.

01:12:43 The film industry

01:12:44 seems to make a lot of effort

01:12:46 for its acoustics,

01:12:48 just like the rooms

01:12:50 in which we see the films.

01:12:52 You may have noticed

01:12:54 that these rooms

01:12:56 are often thick curtains on the walls.

01:12:58 These are soundproof or acoustic curtains

01:13:00 and they are much thicker

01:13:02 than standard curtains.

01:13:04 They are made of heavier fabric

01:13:06 and are woven tight

01:13:08 or have better quality lining.

01:13:10 This allows them to absorb the sound

01:13:12 and reduce the acoustic reflection

01:13:13 of the ceiling

01:13:15 and the walls of the room.

01:13:17 In the end,

01:13:19 it creates a much better sound experience.

01:13:21 This is why the curtains

01:13:23 are so thick in cinemas.

01:13:25 They help to trap the sound

01:13:27 by providing an isolation

01:13:29 from a practical point of view.

01:13:31 This curtain is also there

01:13:33 to prevent the noise of footsteps

01:13:35 during the screening of films.

01:13:37 This concept of sound trap

01:13:39 is also the reason

01:13:41 why the sound is stronger

01:13:42 in a room.

01:13:44 Any speaker placed or suspended

01:13:46 in an open space

01:13:48 projects its sound in all directions.

01:13:50 When the speaker vibrates

01:13:52 to create sound waves,

01:13:54 an equal amount of energy

01:13:56 goes from the front and back.

01:13:58 By placing a speaker

01:14:00 in a form of speaker,

01:14:02 we can redirect some of the energy

01:14:04 coming from the back of the speaker

01:14:06 and project it forward.

01:14:08 By placing the speaker in a cup,

01:14:10 the sound is stronger

01:14:11 than what you would hear

01:14:13 when you take it out of the cup.

01:14:15 Speaking of phones and speakers,

01:14:17 have you ever wondered

01:14:19 why your mobile phone

01:14:21 generates a noise in your speaker?

01:14:23 This can happen when

01:14:25 two gadgets are close to each other

01:14:27 and your mobile phone

01:14:29 tries to send and receive data.

01:14:31 Information transfer

01:14:33 produces electromagnetic disturbances

01:14:35 in the environment of the speakers.

01:14:37 This creates noise in the audio

01:14:39 coming from your speakers.

01:14:40 A simple way to avoid

01:14:42 this annoying noise

01:14:44 is to simply move your phone

01:14:46 away from your speaker

01:14:48 or vice versa.

01:14:50 This will eliminate

01:14:52 what we call electromagnetic interference.

01:14:54 Research in the United States

01:14:56 showed that on average

01:14:58 74% of people

01:15:00 had at least two pairs of headphones

01:15:02 or two audio headphones.

01:15:04 46% of them mentioned

01:15:06 that they used their headphones

01:15:08 two hours a day.

01:15:09 Some people choose their headphones

01:15:11 based on their appearance.

01:15:13 Others choose their sound quality.

01:15:15 In both cases,

01:15:17 finding the right gadget is important

01:15:19 because many people are willing

01:15:21 to spend more than 100 euros on it.

01:15:23 Headphones and other headphones

01:15:25 have become real fashion accessories.

01:15:27 This is why well-known personalities

01:15:29 try to have an impact on this industry

01:15:31 as if it were the fashion industry.

01:15:33 Music enthusiasts Dr. Dre and Jimmy Yovine

01:15:35 have now lost track of the brand

01:15:37 that is now known worldwide

01:15:38 for Beats by Dre headphones.

01:15:40 They were walking along the Pacific Ocean

01:15:42 one day in 2006

01:15:44 discussing a shoe business

01:15:46 because they had received an offer

01:15:48 from a major brand in this field.

01:15:50 After a few discussions,

01:15:52 they decided that they wanted to do

01:15:54 something that they were more passionate about

01:15:56 and they decided to sell their headphones.

01:15:58 The idea of the duo

01:16:00 turned into a brand bought by Apple

01:16:02 in 2014 for 3 billion dollars.

01:16:04 It was the biggest transaction

01:16:06 of the year for Apple

01:16:07 and Beats by Dre

01:16:09 controlled 70% of the headphone market

01:16:11 at the time of the signing.

01:16:13 This operation allowed Apple

01:16:15 to take control of this sector.

01:16:17 The release in 2016

01:16:19 of their famous wireless headphones,

01:16:21 the Airpods,

01:16:23 has comforted the company

01:16:25 in this position.

01:16:27 But how do these wireless headphones

01:16:29 that many of us own

01:16:31 really work?

01:16:33 They actually depend on internal batteries

01:16:35 but sometimes they still work

01:16:36 thanks to AA or AAA standard batteries.

01:16:38 They receive signals transmitted by wire

01:16:40 from their paired audio source,

01:16:42 whether it's your phone

01:16:44 or your laptop.

01:16:46 These signals are coded by the device

01:16:48 and are transmitted most often

01:16:50 by radio frequencies

01:16:52 or infrared supports.

01:16:54 The headphones receive the signal

01:16:56 and decode it into audio

01:16:58 and you can enjoy your music

01:17:00 in all freedom.

01:17:02 Let's go!

01:17:03 Well, I know it's a bit cold or touchy,

01:17:06 especially during a wintery, icy day,

01:17:08 but did you know that brass door handles

01:17:10 are actually really useful

01:17:12 in addition to being elegant and shiny?

01:17:14 As it is a brass alloy,

01:17:16 brass has antimicrobial properties.

01:17:18 This means it can help eliminate

01:17:20 germs and harmful bacteria,

01:17:22 sometimes in less than two hours.

01:17:24 In very busy places,

01:17:26 it is even more useful.

01:17:28 But since brass is much more expensive

01:17:31 than other metals,

01:17:32 such as nickel and steel,

01:17:34 we don't see many door handles

01:17:36 of this type anymore.

01:17:38 Speaking of beautiful, versatile objects,

01:17:40 most screwdrivers have a little secret

01:17:42 that is unique to them.

01:17:44 They can sometimes slip into a key

01:17:46 to create more torque

01:17:48 when torqued,

01:17:50 not to mention their usefulness

01:17:52 when it comes to screws

01:17:54 located in difficult to reach places.

01:17:56 There is a reason why women's shirt buttons

01:17:58 are intended for left-handed people

01:18:00 and not for right-handed people.

01:18:01 This practice dates back to the time

01:18:03 when women's shirts helped women to dress up

01:18:05 and it was easier for them

01:18:07 to do their job with this orientation.

01:18:09 The fact that buttons are placed this way

01:18:11 was a sign of wealth.

01:18:13 It is therefore easy to imagine

01:18:15 why this practice has persisted,

01:18:17 even if most people

01:18:19 dress up themselves nowadays.

01:18:21 The next time you receive a package

01:18:23 in your mail,

01:18:25 take a look at the cutter.

01:18:27 If it has diagonal lines on the blade,

01:18:29 it means that the blade is broken.

01:18:30 If you cut continuously from the cardboard,

01:18:32 you can use the sharp edge of the blade.

01:18:34 To avoid buying a new cutter,

01:18:36 the upper segment of the next line

01:18:38 can break to obtain

01:18:40 a new super-sharp edge.

01:18:42 To do this,

01:18:44 look at the small hole at the base of the tool,

01:18:46 sometimes called the blade breaker.

01:18:48 The people who came up with this brilliant invention

01:18:50 are engineers who were inspired

01:18:52 by the way chocolate bars are divided.

01:18:54 Wait a minute,

01:18:56 I don't have a knife.

01:18:58 Don't throw away this cardboard package right away.

01:18:59 It is very likely

01:19:01 that you have a bag of silica gel

01:19:03 somewhere at the bottom of the box.

01:19:05 As this gel is a drying tool,

01:19:07 it absorbs the humidity of its environment

01:19:09 so that you can keep these bags

01:19:11 for other occasions.

01:19:13 If you need to dry your phone

01:19:15 or another electrical object,

01:19:17 you can place it in a container

01:19:19 next to the silica gel

01:19:21 to reduce damage.

01:19:23 No need to be a mechanic

01:19:25 to know when the tires of a standard car

01:19:27 are properly equipped

01:19:28 because they are equipped

01:19:30 with a well-designed indicator.

01:19:32 If you look closer,

01:19:34 you will see that the tire strips

01:19:36 are made up of a pile of rubber notches.

01:19:38 When the marks are equal to the perpendicular bars,

01:19:40 this is the sign that you must make an appointment

01:19:42 with your local car service

01:19:44 because it is very likely

01:19:46 that the tires have lost

01:19:48 most of their traction

01:19:50 and that they are no longer safe for driving.

01:19:52 The upper corners of a car's windshield

01:19:54 have textured black dots

01:19:56 and this detail is not there

01:19:57 for design reasons.

01:19:59 This is a coating in fritz,

01:20:01 which means that a special type

01:20:03 of ceramic paint is added to the glass

01:20:05 to protect its sealant seal

01:20:07 from UV rays.

01:20:09 It also allows you to conceal

01:20:11 and create a coarser surface

01:20:13 for the glue used

01:20:15 to put the glass in place.

01:20:17 Every time you hit the road,

01:20:19 check if there is a small strip

01:20:21 under the rearview mirror of your car.

01:20:23 I bet you didn't know

01:20:25 that the rearview mirror

01:20:26 is a night vision device.

01:20:28 It uses a prismatic glass technology

01:20:30 to blur the reflection

01:20:32 and reduce the glare

01:20:34 of the headlights behind you

01:20:36 in traffic.

01:20:38 These manual rearview mirrors

01:20:40 were invented in the 1930s

01:20:42 but they became the norm

01:20:44 in the 1970s.

01:20:46 When you are in the car,

01:20:48 take a look at the headrests

01:20:50 because you probably don't know

01:20:52 that they have a hidden function.

01:20:54 They are made of metal

01:20:55 and have a very strong metal bar.

01:20:57 If you ever get stuck in a car

01:20:59 and you have to get out of it quickly,

01:21:01 these bars can be very useful

01:21:03 to break the car's windows.

01:21:05 So you are driving around

01:21:07 and suddenly you run out of gas.

01:21:09 What I am about to describe

01:21:11 is more like a joke

01:21:13 than a real situation

01:21:15 that could happen.

01:21:17 But what happens

01:21:19 if you are in such a hurry

01:21:21 that you accidentally leave

01:21:23 the petrol gun

01:21:24 in the tank?

01:21:26 Well, the guns

01:21:28 were designed to avoid any risk.

01:21:30 They have a separation device

01:21:32 that allows the pipe

01:21:34 to detach when you pull it

01:21:36 with enough force.

01:21:38 Initially designed

01:21:40 in the early 20th century

01:21:42 to be worn exclusively

01:21:44 by basketball players,

01:21:46 baskets have quickly become

01:21:48 one of the essential items

01:21:50 of fashion,

01:21:52 because if you look closer

01:21:53 you will see that they have

01:21:55 two additional holes

01:21:57 on the side,

01:21:59 similar to those of shoe laces.

01:22:01 They are made like this

01:22:03 not only to provide

01:22:05 additional ventilation

01:22:07 but also to allow people

01:22:09 to be more creative

01:22:11 with their laces

01:22:13 when they wear their shoes.

01:22:15 Admit it,

01:22:17 you always thought

01:22:19 that the chopsticks

01:22:21 were wooden tools

01:22:22 with a square-shaped end.

01:22:24 The chopsticks made in this way

01:22:26 are from an old Japanese

01:22:28 traditional design

01:22:30 that allows you to break

01:22:32 the ends easily.

01:22:34 The separate end

01:22:36 can then be used

01:22:38 as a support for the chopsticks

01:22:40 to keep them cleaner

01:22:42 in the hope that they can be reused

01:22:44 since they will not touch the table

01:22:46 or any other surface.

01:22:48 Women's bikes have a special design

01:22:50 with a lower frame

01:22:51 which is mostly intended

01:22:53 to compensate for the smaller size

01:22:55 of women compared to that of a normal man.

01:22:57 If this is the case for the handlebars

01:22:59 and the saddle,

01:23:01 the general frame is lower

01:23:03 for an additional reason.

01:23:05 At the time when women

01:23:07 wore long skirts and dresses

01:23:09 all day long,

01:23:11 they had to make sure

01:23:13 that their clothes

01:23:15 would not get stuck in the frame.

01:23:17 This is how we designed

01:23:19 the new handlebars

01:23:20 to make the work of cleaning teeth

01:23:22 easier.

01:23:24 There is a secret explanation

01:23:26 related to each of the colors

01:23:28 dating back to the 1970s.

01:23:30 At that time,

01:23:32 people were increasingly interested

01:23:34 in their oral teeth health

01:23:36 and were looking for products

01:23:38 that could do more than

01:23:40 simply clean teeth.

01:23:42 A company was the first

01:23:44 to do so by adding a mouthwash

01:23:46 to its toothpaste,

01:23:48 which is a special ingredient

01:23:49 that helps to take care of the gums.

01:23:51 Speaking of toothpaste,

01:23:53 check the cap the next time

01:23:55 you open a new tube

01:23:57 and you might be surprised.

01:23:59 There is a sort of pointed cone

01:24:01 inside the cap

01:24:03 which allows you to pierce

01:24:05 the toothpaste seal

01:24:07 without cutting yourself

01:24:09 or damaging your nail.

01:24:11 Not to mention that it is more hygienic

01:24:13 since you will not be able

01:24:15 to transfer germs

01:24:17 to your teeth.

01:24:18 The toothpaste is also a very practical

01:24:20 accessory hidden in the hairs.

01:24:22 In addition to giving the toothbrush

01:24:24 a cooler look,

01:24:26 they also have a practical purpose.

01:24:28 Most toothbrushes

01:24:30 have a blue hair pattern

01:24:32 interwoven with white hairs.

01:24:34 This blue tint is intended

01:24:36 to pale to indicate

01:24:38 when you should replace

01:24:40 your toothbrush.

01:24:42 Dentists say that toothbrushes

01:24:44 must be replaced

01:24:46 with a new toothbrush

01:24:47 to avoid the risk

01:24:49 of suffocation.

01:24:51 The most dangerous problem

01:24:53 if a person swallows

01:24:55 one of these pieces

01:24:57 is the obstruction

01:24:59 of the respiratory tract.

01:25:01 The presence of a hole

01:25:03 inside the Lego head

01:25:05 allows the air to flow

01:25:07 freely through the piece

01:25:09 until it can be removed

01:25:11 safely.

01:25:13 We are now used

01:25:15 to all kinds of modern bulbs,

01:25:16 some tubular,

01:25:18 others in diamond shape

01:25:20 and others still completely crooked.

01:25:22 Historically,

01:25:24 bulbs were round

01:25:26 and this initial shape

01:25:28 was useful in itself.

01:25:30 It was mainly due to the fact

01:25:32 that glass bulbs were blown by hand,

01:25:34 which gave them this round shape at the beginning.

01:25:36 The practical reason

01:25:38 was that the filament of the bulb

01:25:40 had to be at the same distance

01:25:42 from each surface

01:25:44 and the only way to achieve this

01:25:45 was to make the glass

01:25:47 in the shape of a globe.

01:25:49 The cylinder

01:25:51 at the end of a cable

01:25:53 is placed here

01:25:55 and seems totally useless.

01:25:57 In fact, it is a ferrite pearl

01:25:59 that is associated

01:26:01 with many electrical wires

01:26:03 to reduce electromagnetic interference.

01:26:05 The electrical wires

01:26:07 act as involuntary antennas

01:26:09 and diffuse the emitted EMI.

01:26:11 There is a reason

01:26:13 why the electrical wires

01:26:14 are placed here.

01:26:16 A circular object

01:26:18 evenly distributes heat

01:26:20 unlike rectangular or square objects.

01:26:22 When you place containers

01:26:24 with these shapes inside,

01:26:26 the energy is concentrated

01:26:28 in the corners

01:26:30 instead of being evenly distributed

01:26:32 like in a round container.

01:26:34 The temperature gauge

01:26:36 of a bread grid

01:26:38 generally determines

01:26:40 the degree of cooking of the pies.

01:26:42 White and sweet bread

01:26:43 heat up much faster

01:26:45 than brown and rye bread.

01:26:47 The older the bread,

01:26:49 the more time it will need

01:26:51 to get the golden result you want.

01:26:53 Most ovens

01:26:55 allow you to leave the door open

01:26:57 when you cook a dish inside.

01:26:59 You probably think

01:27:01 that the goal is to cool the oven

01:27:03 after use.

01:27:05 In fact, its goal

01:27:07 is to focus on the cooking

01:27:09 of the top of the dish

01:27:11 and not on the cooking of the bottom.

01:27:12 By controlling the accumulation

01:27:14 of heat and steam

01:27:16 by releasing it through the slightly open door,

01:27:18 you get the desired result

01:27:20 without cooking the whole dish

01:27:22 until it is crispy.

01:27:24 You probably noticed

01:27:26 that your dishwasher

01:27:28 has specific areas

01:27:30 for different types of lids and dishes.

01:27:32 But all dishes must be

01:27:34 oriented to the center

01:27:36 and not all in the same direction.

01:27:38 The types of food

01:27:40 that are used in the kitchen

01:27:41 are usually

01:27:43 cooked in the same way

01:27:45 as the dishes in the kitchen.

01:27:47 The dishwasher

01:27:49 receives the strongest gel

01:27:51 and the glucid-based stains

01:27:53 from tomatoes and potatoes

01:27:55 must be placed

01:27:57 in this area.

01:27:59 The detergent is more concentrated

01:28:01 on the outside

01:28:03 during cleaning,

01:28:05 which creates a cascade-like cleaning.

01:28:07 This is why the protein-based stains

01:28:09 are removed

01:28:10 as well as efficiently

01:28:12 if you switch the switch on the side

01:28:14 or if you use the pull.

01:28:16 So if you want to save money

01:28:18 on heating

01:28:20 and try to heat your room quickly

01:28:22 on a cold day,

01:28:24 put the fan in motion.

01:28:26 It will push the air up

01:28:28 and spread the hot air around you,

01:28:30 thus heating the room more efficiently.

01:28:32 Do you still use post-it notes

01:28:34 instead of these new sophisticated applications

01:28:36 on all imaginable devices?

01:28:38 In fact,

01:28:39 they always end up falling.

01:28:41 If you have already encountered this problem,

01:28:43 it is because you took them off

01:28:45 from the bottom to the top.

01:28:47 This is the way of doing it

01:28:49 that causes the rolling.

01:28:51 By taking them off on the side,

01:28:53 you make sure they stay flat

01:28:55 and ready to remind you of your daily tasks.

01:28:57 Did you know that the open boxes

01:28:59 were invented only 50 years

01:29:01 after the can boxes

01:29:03 became commonplace?

01:29:05 So how was it possible

01:29:07 to make a can box

01:29:08 in case you missed

01:29:10 your faithful open box?

01:29:12 All you need is a metal spoon.

01:29:14 Place the can on the work surface,

01:29:16 hold it firmly

01:29:18 and hold the spoon's head.

01:29:20 Press and rub the edge

01:29:22 of the can's lid

01:29:24 on a small surface.

01:29:26 It takes time,

01:29:28 but by rubbing,

01:29:30 a small notch is formed

01:29:32 and soon turns into a hole.

01:29:34 Once the hole is wide enough

01:29:36 to fit the can,

01:29:37 you can continue to rub the edges

01:29:39 until you can finally

01:29:41 access the meal it contains.

01:29:43 You've won!

01:29:45 Most toilets depend on

01:29:47 the pressure of the water

01:29:49 and the gravity to function.

01:29:51 A power failure won't affect them.

01:29:53 But if yours need electricity

01:29:55 to function,

01:29:57 you should worry about their use

01:29:59 in case of a power failure.

01:30:01 The good news is that electricity

01:30:03 is only used to fill the toilets

01:30:05 and to flush the toilet.

01:30:06 If the water still works,

01:30:08 open the toilet tank,

01:30:10 pour a few litres

01:30:12 and you can flush

01:30:14 whatever you need.

01:30:16 The nozzles in the shower's

01:30:18 pipes are created

01:30:20 over a long period of time.

01:30:22 It's inevitable.

01:30:24 We lose 50 to 100 hairs a day

01:30:26 and many of them

01:30:28 try to fit in our shower pipes.

01:30:30 The hair is the main

01:30:32 obstruction,

01:30:34 which is the water

01:30:35 that's left in the pipe

01:30:37 after removing the grid.

01:30:39 Use a damp cloth

01:30:41 around the tip

01:30:43 to make sure the air

01:30:45 can't escape.

01:30:47 The vacuum cleaner

01:30:49 can vacuum

01:30:51 things that obstruct

01:30:53 much more easily.

01:30:55 You'll avoid the plumber's

01:30:57 costs who use

01:30:59 this technique themselves.

01:31:01 To make your candles last longer,

01:31:03 you can use a brush.

01:31:04 The empty space

01:31:06 between the windows

01:31:08 is there for a good reason.

01:31:10 You can use a brush

01:31:12 to clean the window

01:31:14 from the door.

01:31:16 It's easy to access

01:31:18 this space from the bottom.

01:31:20 Open the bottom

01:31:22 and push the brush

01:31:24 into the hole.

01:31:26 When you park in a garage,

01:31:28 you can't decide

01:31:30 how far you should be.

01:31:32 You can't let the bumper

01:31:33 block the wall.

01:31:35 Stretching a rope

01:31:37 with a tennis ball

01:31:39 from the ceiling

01:31:41 will help you

01:31:43 decide the best distance

01:31:45 to park from the wall.

01:31:47 We've all been told

01:31:49 to unlock a lock

01:31:51 with WD-40 or lubricant.

01:31:53 Yes, we all know

01:31:55 we should have some at home.

01:31:57 But if you don't,

01:32:00 you can put it in the lock.

01:32:01 Keep doing it

01:32:03 until the lock's hole

01:32:05 is lubricated

01:32:07 and the key works.

01:32:09 Clamps can damage

01:32:11 the taps and shower heads

01:32:13 when you use them to fix them

01:32:15 and they're hard to grab.

01:32:17 Take two pieces

01:32:19 of a old watering pipe

01:32:21 and attach them to the clamp's jaw.

01:32:23 You'll see a huge improvement

01:32:25 in grip and you'll avoid

01:32:27 the risk of wear.

01:32:29 You can find a good use

01:32:30 for used rubber

01:32:32 for different things at home.

01:32:34 When you have enough

01:32:36 to tighten or loosen

01:32:38 a screw with a screwdriver,

01:32:40 try using a simple rubber.

01:32:42 Put some in the screwdriver's jaw

01:32:44 and it'll hold much better.

01:32:46 Moving cement blocks

01:32:48 is not a risk for the lower back.

01:32:50 Even with a wheelbarrow,

01:32:52 you can risk

01:32:54 dropping the cement on the floor

01:32:56 without damaging it.

01:32:58 The size of the block

01:32:59 makes all the difference.

01:33:01 Try lifting the edge

01:33:03 of the first pipe with a lever

01:33:05 and then push and move it

01:33:07 by gradually directing

01:33:09 the three pipes to the desired place.

01:33:11 Just make sure

01:33:13 you don't do it in a slope.

01:33:15 The first time you hit a nail

01:33:17 can be a big success

01:33:19 or a really hard hit.

01:33:21 A perfect-shaped hair clip

01:33:23 will hold the nail in place

01:33:25 and you'll be safe

01:33:27 from any damage.

01:33:28 Use a pencil instead of a pen

01:33:30 or a pencil when working

01:33:32 with a circular saw

01:33:34 to make sure the marks

01:33:36 are not erased.

01:33:38 They'll also be easier to see

01:33:40 under the water.

01:33:42 Checking the roof's pipes

01:33:44 and determining when they need

01:33:46 to be cleaned can take a long time.

01:33:48 Use tape to attach a mirror

01:33:50 to the end of a broom

01:33:52 and check if the gutters

01:33:54 need to be cleaned.

01:33:56 Use a pair of sports shoes

01:33:57 at the foot of the ladder.

01:33:59 The distance between the shoe

01:34:01 and its grip

01:34:03 will provide an additional level

01:34:05 of safety.

01:34:07 Liquid calfing products

01:34:09 are usually in the shape

01:34:11 of huge tubes

01:34:13 so you can't use them

01:34:15 all at once.

01:34:17 The liquid's hardened tips

01:34:19 create a plug.

01:34:21 Take a used lid

01:34:23 and drill it

01:34:25 into the lid.

01:34:26 The cracks are holes

01:34:28 to prevent them from cracking

01:34:30 and breaking during cooking.

01:34:32 Without these holes,

01:34:34 the steam would accumulate

01:34:36 in the dough

01:34:38 until it burst.

01:34:40 If you look at the soda bottle

01:34:42 you'll see a plastic disc

01:34:44 inside.

01:34:46 It seals the liquid and gas

01:34:48 so the drink stays sparkling.

01:34:50 The long neck of the bottle

01:34:52 is designed to hold it there.

01:34:54 It's hard to see the dishes

01:34:55 when they're in the microwave oven

01:34:57 because of the black

01:34:59 blackish grey on the glass.

01:35:01 But if it's there,

01:35:03 it's to prevent

01:35:05 the harmful waves

01:35:07 from escaping.

01:35:09 It acts like a shield

01:35:11 to protect you

01:35:13 while providing adequate

01:35:15 cooking for the food.

01:35:17 Some products,

01:35:19 like chips,

01:35:21 contain up to 43% nitrogen.

01:35:23 But nitrogen is the opposite.

01:35:24 The oxygen,

01:35:26 the gas we breathe

01:35:28 in contact with the chips,

01:35:30 would induce a reaction

01:35:32 that would quickly oxidize them.

01:35:34 This phenomenon,

01:35:36 called oxidation,

01:35:38 is well known.

01:35:40 Nitrogen is an inert gas

01:35:42 that keeps food

01:35:44 and prevents it from getting damaged

01:35:46 while transported.

01:35:48 Chips wrapped in a cushion

01:35:50 stay crispy

01:35:52 and have a nice shape.

01:35:53 Before the addition of the holes,

01:35:55 the inside was usually

01:35:57 greasy and sticky

01:35:59 and the edges were crispy.

01:36:01 The marks on the paper

01:36:03 are not used to write

01:36:05 the dates or the numbering lists.

01:36:07 They were originally added

01:36:09 to serve as a protection.

01:36:11 At the time,

01:36:13 rats were a real problem

01:36:15 in houses

01:36:17 and paper was one of their favourite materials.

01:36:19 Marks were used

01:36:21 to write.

01:36:22 This hole in the stem of the chip

01:36:24 is not there to prevent

01:36:26 the chewing of the chip.

01:36:28 It serves to keep the candy in place.

01:36:30 The water-filled confectionery

01:36:32 enters the hollow of the stick

01:36:34 and, once solidified,

01:36:36 holds the chip in place.

01:36:38 This makes it more fragile

01:36:40 and easy to detach.

01:36:42 Vacuum cleaners have a lot of accessories,

01:36:44 but do we really know

01:36:46 what this long brush is for?

01:36:48 It is useful for dust removal

01:36:50 and its shape is perfect

01:36:51 for cleaning frames, curtains

01:36:53 or tiles.

01:36:55 What is the difference

01:36:57 between a wooden belt

01:36:59 and a plastic belt?

01:37:01 A cedar wooden belt

01:37:03 not only gives the clothes a shape,

01:37:05 but also repels mites and other insects.

01:37:07 Salt is not only useful in the kitchen.

01:37:09 It can get rid of strong odours.

01:37:11 Rubbing salt on your fingers

01:37:13 after chopping garlic

01:37:15 should get rid of the odour

01:37:17 and it also works for shoes.

01:37:19 A secret drawer in the bottom

01:37:20 can be removed

01:37:22 to clean all these

01:37:24 annoying little crumbs of bread.

01:37:26 If you can't get a chocolate out of the box,

01:37:28 look at these little holes next to it.

01:37:30 They are there to help you.

01:37:32 If you press one of these holes,

01:37:34 the chocolate will easily come out of its notch.

01:37:36 When you drink a sip of coffee

01:37:38 in a cup with a lid,

01:37:40 the pressure in the cup decreases

01:37:42 and the air tries to enter.

01:37:44 The little hole on the lid

01:37:46 allows the air to flow

01:37:48 through the main opening.

01:37:49 And that's not all.

01:37:51 The little pressure on the top of the lids

01:37:53 is used to inform the staff

01:37:55 and customers

01:37:57 about the contents of the cups

01:37:59 to differentiate them.

01:38:01 There is a legend

01:38:03 about each little crumb.

01:38:05 Just look at which one is in the bottom

01:38:07 to know what it belongs to.

01:38:09 The numbers on the fruit labels

01:38:11 give us information

01:38:13 about how they were grown.

01:38:15 If there are four numbers,

01:38:17 it means that they were treated with pesticides.

01:38:18 If there are five numbers,

01:38:20 the first one is an egg.

01:38:22 It is from organic farming.

01:38:24 If there are five numbers,

01:38:26 the first one is an eight,

01:38:28 it has undergone genetic modifications.

01:38:30 When you are on your way to your car

01:38:32 after finishing and packing all your groceries,

01:38:34 remember to use the hooks on the cart

01:38:36 to hang the bags.

01:38:38 This way, the most fragile items

01:38:40 like bread, eggs, or fruits and vegetables

01:38:42 will not be crushed

01:38:44 by the heavier products.

01:38:46 If you are not able to hold your tape measure

01:38:47 when you are trying to measure something,

01:38:49 you can just nail it.

01:38:51 Place your nail

01:38:53 at the level of the dedicated hole

01:38:55 where the tape measures are usually located

01:38:57 and you can just unroll it.

01:38:59 The McFlurry square spoon

01:39:01 is designed to easily mix

01:39:03 the fillings with the ice.

01:39:05 It attaches directly to a machine

01:39:07 and starts spinning.

01:39:09 The external hooks

01:39:11 suck quickly because of the rain.

01:39:13 You see this little hole down there?

01:39:15 It's a motor.

01:39:16 This trick allows you to lubricate the mechanism

01:39:18 and the key should spin again effortlessly.

01:39:20 You've been hitting the bottom of the ketchup bottle

01:39:22 for two hours, but nothing comes out.

01:39:24 Here's a little trick.

01:39:26 Put the bottle diagonally

01:39:28 and tap it towards the middle of the neck.

01:39:30 In many fast food restaurants,

01:39:32 customers have small paper cups

01:39:34 to serve ketchup or mustard.

01:39:36 Ready for the scoop?

01:39:38 These little ramekins are actually supposed

01:39:40 to unfold to become real little paper plates

01:39:43 that can hold a lot more sauce.

01:39:44 The little hole on the handle

01:39:46 of the pan or panes

01:39:48 is not only for hanging them on the wall.

01:39:50 While you're cooking,

01:39:52 place the end of the utensil handle

01:39:54 you're using in this hole.

01:39:56 It will be held above the preparation

01:39:58 that's cooking and will prevent splinters.

01:40:00 The colored panes of a toothbrush

01:40:02 are there to tell us

01:40:04 when it's necessary to change them.

01:40:06 If you notice that these panes

01:40:08 have considerably paled,

01:40:10 change the toothbrush

01:40:12 or just the head, depending on the case.

01:40:13 The upper hole of the sink

01:40:15 has many functions.

01:40:17 First, it prevents water from overflowing

01:40:19 if someone forgets to close the tap.

01:40:21 It also allows water to evaporate faster

01:40:23 and allow air to escape

01:40:25 while the water is running.

01:40:27 Most of the metallic zippers

01:40:29 have a hidden locking system

01:40:31 that can save you from awkward moments

01:40:33 like an open bracket.

01:40:35 Don't let the strap go up.

01:40:37 If you lower the strap,

01:40:39 the zipper locks automatically.

01:40:41 The small notches under the strap

01:40:42 will prevent water from flowing.

01:40:44 Perimetric milk produces gases

01:40:46 like most perimetric foods.

01:40:48 Some plastic milk cans

01:40:50 have a concave part on one side.

01:40:52 If the milk spins and produces gases,

01:40:54 this part of the bottle will inflate

01:40:56 and the concave shape becomes convex.

01:40:58 The same thing will happen

01:41:00 if you put the can in the freezer.

01:41:02 Solidified milk takes up more space

01:41:04 than liquid form.

01:41:06 The foam bath is not just for fun

01:41:08 and to feel good.

01:41:10 It also keeps the temperature.

01:41:11 The bubbles keep the heat in the water

01:41:13 and you can enjoy your bath longer.

01:41:15 However,

01:41:17 it only works for acrylic baths

01:41:19 made of metal

01:41:21 that quickly lose heat in all cases.

01:41:23 Many cups and mugs

01:41:25 have small grooves on the bottom.

01:41:27 This is designed for dishwashers.

01:41:29 They allow water to flow

01:41:31 and thus avoid getting everywhere

01:41:33 when you get out of the dishwasher.

01:41:35 These grooves help to circulate the air

01:41:37 so that the cup does not crack

01:41:39 and the water is boiling.

01:41:40 The small tips in the cream tube caps

01:41:42 are also useful.

01:41:44 Most of the tubes are sealed

01:41:46 with aluminum.

01:41:48 It is impossible to drill

01:41:50 without saying goodbye to your nails.

01:41:52 These tips open all the cream tubes,

01:41:54 even the most resistant ones.

01:41:56 The brush of the dishwashers

01:41:58 is not used to clean and polish

01:42:00 your shoes when you walk.

01:42:02 Applying wax on a moving dishwasher

01:42:04 can be complex.

01:42:06 These brushes are there

01:42:08 to reduce the risk

01:42:09 that the bottom of a long coat

01:42:11 or a pair of worn pants

01:42:13 can get stuck between the steps.

01:42:15 All the tic-tac boxes

01:42:17 are designed to only let out

01:42:19 one tic-tac at a time.

01:42:21 The lid is shaped like a candy.

01:42:23 Turn the box down,

01:42:25 shake it gently and open it.

01:42:27 You will see that there is only one candy

01:42:29 in the lid hole.

01:42:31 If you usually shake the box

01:42:33 until it falls right into your mouth,

01:42:35 then you don't know how to eat tic-tacs.

01:42:37 It prevents sailors

01:42:38 from hitting their heads

01:42:40 on the ceiling,

01:42:42 typically very low, of ships.

01:42:44 There are a multitude of amazing things

01:42:46 that you can do with products

01:42:48 that you have at home

01:42:50 and that are intended for other uses.

01:42:52 We will explore some of these possibilities

01:42:54 as well as articles of every day

01:42:56 that fill other functions

01:42:58 that you may not be aware of.

01:43:00 Many kitchen scissors

01:43:03 have a lace opening

01:43:06 where the handles and blades meet.

01:43:07 You can use it

01:43:09 to peel off difficult herbs

01:43:11 like thyme, rosemary and chives.

01:43:13 This saves you time

01:43:16 trying to remove the leaves by hand.

01:43:18 And if you are short of vases,

01:43:20 you can offer roses

01:43:22 to the ones you love this way.

01:43:24 Just be careful

01:43:26 where you point the tip of the scissors.

01:43:28 The metal tongue of the soda cans

01:43:30 can be turned

01:43:32 so that you can slip a straw in it

01:43:35 and put the can in your mouth.

01:43:36 This tongue has also replaced

01:43:38 the traction ring

01:43:40 created in the early 1960s.

01:43:42 You remember those, don't you?

01:43:44 They were quite sharp

01:43:46 and easy to remove

01:43:48 and they posed a danger to others.

01:43:50 Now you can slip your straw

01:43:52 directly into the tongue

01:43:54 and also make bubbles.

01:43:56 Sometimes when you buy

01:43:58 a new garment,

01:44:00 a small plastic bag is attached

01:44:02 with an extra button

01:44:04 to prevent the fabric from moving.

01:44:05 This fabric is often used

01:44:07 to repair any holes.

01:44:09 It can also be used

01:44:11 to test the effects

01:44:13 of various detergents on the garment.

01:44:15 It is also practical

01:44:17 to test the washing programs

01:44:19 before washing the entire garment.

01:44:21 You can use a screwdriver

01:44:23 to make a lever

01:44:25 if you have trouble lifting

01:44:27 or moving something.

01:44:29 Some also have a hexagonal handle

01:44:31 that fits inside

01:44:33 to make a turn

01:44:34 and, once again,

01:44:36 to make a lever.

01:44:38 Practical for those

01:44:40 who don't have much strength in their arms.

01:44:42 Elastics are useful

01:44:44 for many things.

01:44:46 But if you have a bottle

01:44:48 or a jar that is difficult to open,

01:44:50 you can wrap the elastic

01:44:52 around the plug

01:44:54 for a better grip.

01:44:56 The mechanical stairs

01:44:58 have black brushes on the sides

01:45:00 for the same reason

01:45:02 that people don't always pay attention.

01:45:03 Sometimes, the clothes or laces

01:45:05 can be dangerously close

01:45:07 to the place

01:45:09 where the step meets the edge or skirt.

01:45:11 The brush is a little safety

01:45:13 to prevent this from happening.

01:45:15 It can also prevent pieces of plush

01:45:17 or other small elements

01:45:19 from falling into the gaps.

01:45:21 Tanjean has several features

01:45:23 that are very functional

01:45:25 although a little out of fashion.

01:45:27 The metal rivets around the pockets

01:45:29 help secure the tension points.

01:45:31 This allows them to last

01:45:32 a little longer than the average

01:45:34 although all jeans are not equipped with them.

01:45:36 Many jeans still have a tiny pocket

01:45:38 directly above the main pocket.

01:45:40 Originally,

01:45:43 it was intended to contain a watch.

01:45:45 Even though most of these watches

01:45:47 belong to the past,

01:45:49 many people still use this space

01:45:51 to store coins,

01:45:53 a ring or even a mini USB key.

01:45:55 It may seem a little obvious,

01:45:57 but if you're wondering

01:46:00 why you keep all the grooves

01:46:01 on a car tire,

01:46:03 it's for road grip.

01:46:05 That said,

01:46:07 they are also a good indicator

01:46:09 of your tire wear.

01:46:11 If these grooves are no longer

01:46:13 as deep and almost cover the road,

01:46:15 it's time to change your tires.

01:46:17 If you don't,

01:46:19 the next time you try to stop

01:46:21 suddenly at a red light,

01:46:23 you may be surprised to see

01:46:25 that your car has turned

01:46:27 into a giant roller coaster.

01:46:29 These Chinese watches

01:46:30 are designed not only

01:46:32 to carry your food home,

01:46:34 but also to store it in the fridge.

01:46:36 They also serve as plates

01:46:38 because you can eat directly in them

01:46:40 without worrying about the dirty dishes.

01:46:42 They were patented in 1894

01:46:44 to carry freshly chopped oysters

01:46:47 and were known as "soa oysters".

01:46:49 They were then adapted

01:46:51 to serve as a water container

01:46:53 for food.

01:46:55 When you're sitting in a plane

01:46:58 and you look out the window,

01:46:59 you may have noticed these little holes

01:47:01 or, in some cases,

01:47:03 a small singular opening at the bottom.

01:47:05 It's called an air hole

01:47:07 and it's designed to equalize

01:47:09 the difference in air pressure

01:47:11 that accumulates between

01:47:13 the pressurized cabin

01:47:15 and the outside atmosphere,

01:47:17 especially at high altitudes.

01:47:19 It also releases humidity

01:47:21 between the windows

01:47:23 to prevent frost from forming

01:47:25 on the windows

01:47:27 and obstruct this beautiful view.

01:47:28 Sorry,

01:47:30 but you can't draw a smiley face

01:47:32 right away.

01:47:34 The first cutter was introduced

01:47:36 in 1956

01:47:38 by a Japanese company.

01:47:40 They were inspired

01:47:42 by chocolate tablet squares.

01:47:44 Almost all the bands to be measured

01:47:47 have a hollow slit

01:47:49 in their metallic ends.

01:47:51 It's called a nail clip

01:47:53 and you can attach it

01:47:56 to a nail or a screw.

01:47:57 It's a handy trick

01:47:59 to measure without needing

01:48:01 someone else to hold it in place.

01:48:03 Hair clips have grooves

01:48:06 on one of the branches

01:48:08 to hold your hair in place.

01:48:10 The straight side

01:48:12 must be at the top

01:48:14 while the grooves

01:48:16 must be against your head.

01:48:18 They're also called Bob clips

01:48:20 because of Bob's hairstyle,

01:48:22 the square cut

01:48:25 in 1920,

01:48:26 although the clips

01:48:28 were invented in the 19th century.

01:48:30 Don't forget to remove them

01:48:32 before washing your hair.

01:48:34 If you've ever noticed

01:48:36 the black dots on the windshield

01:48:38 of a car or a bus,

01:48:40 you've probably realised

01:48:42 that it's not meant for decoration.

01:48:44 It's called a fritz

01:48:46 and it's a ceramic paint.

01:48:48 Their main purpose

01:48:50 is to protect the window

01:48:52 from ultraviolet rays.

01:48:54 The adhesive can stick.

01:48:55 If you see a piece of pink adhesive

01:48:57 in a corner,

01:48:59 don't touch it.

01:49:01 It's probably someone's old chewing gum.

01:49:03 If you take a look

01:49:06 at the bottom of a lock,

01:49:08 you're likely to see

01:49:10 one or two little holes.

01:49:12 They're used to evacuate water

01:49:14 trapped inside

01:49:16 because of the rain.

01:49:18 This mini drainage system

01:49:20 prevents the internal system

01:49:23 from getting cold.

01:49:24 And if the lock gets stuck,

01:49:26 you can put a product

01:49:28 with oil inside

01:49:30 to lubricate it

01:49:32 and make it work again.

01:49:34 If you've lost the key

01:49:36 and you want to ease your frustration,

01:49:38 you can scream in the holes.

01:49:40 It won't open it,

01:49:42 but you'll feel a little better.

01:49:44 Some shirts

01:49:46 have a fabric loop around the collar.

01:49:48 It's used to hold the shirt in place.

01:49:50 The loops would have been useful

01:49:52 for the first time in the Navy

01:49:53 because it was easy

01:49:55 to simply hang them on the wall.

01:49:57 In the 1960s,

01:49:59 fashion was to wear

01:50:01 the buttoned shirt up to the top,

01:50:03 which made it

01:50:05 a lot more complicated.

01:50:07 So designers started

01:50:09 to put the loop around the back.

01:50:11 If the student took the loop off,

01:50:13 it meant he was in a stable relationship.

01:50:15 Unless one of his friends

01:50:17 took it off

01:50:19 to make a joke out of him.

01:50:21 And now,

01:50:22 everyone wonders

01:50:24 who they're dating.

01:50:26 Have you ever wondered

01:50:29 why coins have

01:50:31 these little grooves on the edges?

01:50:33 It's a vestige of the old days

01:50:35 when coins were more valuable.

01:50:37 The forgers could easily

01:50:39 file the edges of coins

01:50:41 to make new ones out of gold or silver.

01:50:43 The grooves were created

01:50:45 to make it easier

01:50:47 to tell if a coin was filed.

01:50:50 It's a bit easier today,

01:50:51 but coins always have these details.

01:50:53 And if you ever get bored,

01:50:55 you can try to count

01:50:57 the number of grooves.

01:50:59 Or you can watch

01:51:01 another cool video.

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