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00:00:00You use door handles every day, so it is normal to be worried about the number of germs that could accumulate there.
00:00:06However, it is partly for this reason that we make brass handles.
00:00:11This alloy has an antimicrobial effect and eliminates the microorganisms that would start a colony on your door handle.
00:00:19Your pants have this fifth pocket, which is often considered a small useless pocket.
00:00:24Originally, it was there to provide a safe place for your watch, which became necessary during its invention in 1901.
00:00:31It then continued to serve traditional purposes.
00:00:34Today, it remains a practical place to slip a few tic-tacs.
00:00:38You probably took these little rivets on your jeans for some kind of decorative pattern.
00:00:43Just like this little pocket.
00:00:45In fact, they are incredibly important.
00:00:48They are there to provide additional support to the areas that support the most demanding parts of your clothes, thus preventing them from tearing in an embarrassing way.
00:00:57This little button at the end of your seat belt does not seem to be in place.
00:01:02In fact, it is there so that your buckle always stays at the end.
00:01:06So that you do not have to fidget your seat belt every time you put it on.
00:01:11You are in a new car or a rental car and the gauge tells you that the fuel is starting to run out.
00:01:16From the inside, you do not know which side the tank is on.
00:01:19This can cause you to waste time at the gas station.
00:01:22However, know that the indicator of your fuel gauge is equipped with an arrow that tells you which side you should fill your tank.
00:01:29Some car models may only have one pipe as an indicator, but then it is represented on the side where the tank is.
00:01:37Hiking in the snow requires a particular type of shoe.
00:01:42Suitable shoes also have an additional eyelet in which your lace can pass.
00:01:47By passing your lace through these additional eyelets, you will bring more support to your ankles and feet, and you will also have more stability while you walk.
00:01:56When you walk, the bulbs are also a source of concern.
00:02:00The sweat in your shoes creates friction between your foot and this one, which then contributes to creating the bulbs.
00:02:07The anti-sweat that you use for your laces will also help your feet not to sweat too much.
00:02:12Just make sure to use a transparent product.
00:02:15Cooking for others is always pleasant, but sometimes guests are late.
00:02:20We are all guilty of that, aren't we?
00:02:24The additional drawer under your oven, where you keep all your spare pans,
00:02:29was actually designed to keep your food warm, which is ideal for waiting for guests who are late.
00:02:35Have you ever wondered how long this lock could last when it's outside?
00:02:39In the rain, to protect your bike?
00:02:42There is a small hole at the bottom of this one, which is used to evacuate water in order to avoid corrosion inside.
00:02:49It is also used to pour oil into it, which further extends its lifespan.
00:02:54This hole in the elevator door is not there to check who is inside before embarking on a trip with people you don't like.
00:03:01There is also a lock hole in case it breaks.
00:03:04Ketchup bottles, sauces, and all the other condiments we like, all reach a filling level where it becomes difficult to get the content out.
00:03:12In wine, you try to hit it, shake it, and push objects inside to encourage the tasty condiments to come out.
00:03:19Fortunately, there is an easier way to do it.
00:03:22The marking at the top of the bottle suggests where to tap or press.
00:03:26The sauce will come out more easily and more gently, allowing gravity to alleviate your frustration.
00:03:32Wooden belts are used to help repel unwanted insects and to avoid the proliferation of mushrooms that stain your clothes,
00:03:40because they are made of cedar wood.
00:03:43They contain oils with insecticide and fungicide properties, which were already used by the ancient Egyptians.
00:03:50Even if it was for other purposes.
00:03:54We have all been more or less trained in the technique of dactylography, and we know the correct way to use a keyboard.
00:04:01But you may not have noticed that the F and J keys had a small stop at the bottom.
00:04:06They are there to help you find the correct starting position with your fingers on the keyboard, without having to look at it.
00:04:13If you were lucky enough to have the hublot seat in the plane, you must have noticed the little hole at the bottom of the window.
00:04:20It helps to equalize the air pressure in the plane.
00:04:23The window itself is made of acrylic and is not really glass, which prevents it from fogging up and allows you to admire the landscape during your trip.
00:04:31The bread is not quite real bread.
00:04:34The water can boil and freeze at the same time.
00:04:37Bananas are berries that grow in the grass.
00:04:39Does it seem incredible to you?
00:04:41Did you know that water can be more humid than it is in its natural state?
00:04:45Discover all this in this video.
00:04:47Chewing gums are usually pink because the first to be marketed in 1928 were of this color.
00:04:53Pink was simply the only color of dye that the manufacturer had on hand.
00:04:58The very first chewing gum, however, probably appeared about 9,000 years ago.
00:05:03At the time, people chewed work powder for its medicinal properties, for example, to fight fever.
00:05:10In fact, at different times, people chewed different substances.
00:05:14For example, the ancient Mayans made chewing gums from chicle, a gum that comes from the white latex of the sapotilla.
00:05:22They used it to fight hunger and quench thirst.
00:05:25In North America, people bought the resin of the Picea and the European settlers took up the principle to make a commercial product in the 1840s.
00:05:35You can't name a file C.O.N. on any version of Windows.
00:05:40And it's the same for the combinations of the following letters, including PRN, AUX and NUL.
00:05:47This has to do with the operating system.
00:05:49It creates files itself to store data, and if you could create homonymous files, they wouldn't end up there.
00:05:56If you wanted to get all the possible combinations of a card game, you would spend billions and billions of years mixing them,
00:06:03and you would still only get a third of the possibilities.
00:06:06Think about it, there are 52 cards in a normal game, and the number of possible combinations, without repetition, is 8 times 10 raised to the power of 67.
00:06:16Even if you mix the cards 100 times per second, without repeating the combinations, it will take you several hundred thousands of billions of times the age of the universe.
00:06:26By folding a simple sheet of paper 103 times, you will get a 93 billion light-year thickness, which is greater than the size of the observable universe.
00:06:36But if you decide to check this yourself, you won't be able to fold it more than 12 times, and you will need a very large sheet of paper, let's say half a kilometer long.
00:06:46With an ordinary sheet of paper, you will only get it 7 times.
00:06:50In many supermarkets, you will find two types of bread, industrial and bakery, and they are two different types of bread.
00:06:58The lightest variety, square, and most often cut in advance, is called sandwich bread, and the other is just bread.
00:07:07The difference is that sandwich bread is made especially to be spread.
00:07:12It has a more resistant texture, which allows your slice not to disintegrate when you put, let's say, peanut butter on it.
00:07:19It is also rather soft, which allows you to bite into your sandwich without its content escaping from the sides, which would not be very elegant in public.
00:07:28Finally, bread is kept longer than ordinary bread thanks to the additives it contains.
00:07:34It preserves the texture of the bread for about a week, which allows you to enjoy your delicious sandwiches longer, while traditional bread is generally rancid after a day.
00:07:44There is a state in which the water is both boiling and freezing.
00:07:48It is called the triple point, and it occurs when the three states of a liquid, solid and vapor substance exist at the same time without mixing.
00:07:57For water, the triple point occurs just above the freezing temperature and at an atmospheric pressure of 0.006 atm.
00:08:08The blue bird you can see on the Twitter logo has an official name.
00:08:12It is Larry the Bird, and the creator of the social network named it in tribute to the former NBA player, Larry Bird, of the Boston Celtics.
00:08:21If you have decided to save a little money by charging your smartphone less often, this will disappoint you.
00:08:27To charge a mobile phone, you use tiny amounts of electricity.
00:08:32As a result, after a whole year, you will have saved no more than a miserable euro.
00:08:37The word Jeep is an abbreviation.
00:08:40Originally, this vehicle was called GP, the English acronym for all use.
00:08:45It is only much later that this name became a brand.
00:08:48Bananas have an incurved shape because they are turned towards the sun, and they do not grow in trees, but on a grassy plant.
00:08:55Regimes grow downwards, but the fruit turns itself towards the sun, which gives it this recognizable shape.
00:09:02The spandex owes its name to the anagram of the word expanse, in French, to extend or enlarge.
00:09:08If you had to watch all the videos on YouTube, you would spend about a thousand years in front of your screen.
00:09:14And then again a thousand times longer because of all the new videos that would be published in the meantime.
00:09:19You probably know that tomatoes are technically berries, right?
00:09:23Well, bananas, peppers, watermelons and aubergines are too.
00:09:28There is a small open skin symbol on all cosmetic articles.
00:09:32It is called PAO, period after opening.
00:09:35And it tells you how long you can use your product safely after opening it.
00:09:41The symbol is usually accompanied by a number and the letter M, which means month.
00:09:46Make sure you remember the date you opened your product to know when the 3, 6, 9, 12 or 24 months indicated will have passed.
00:09:55The jack of your headphones often has several rings, each representing different components.
00:10:01A ring corresponds to a mono sound, two to a stereo sound, and the third means that your headphones have a built-in microphone function.
00:10:09To know if the egg you just boiled is well cooked, turn it over a flat surface.
00:10:14If your egg turns regularly without immediately falling over, it is cooked.
00:10:19Instead of using normal water, firefighters extinguish fires with wet water.
00:10:24They add special substances, chemical products that reduce the surface tension that ordinary water has.
00:10:31This allows it to soak objects and spread everywhere much more easily.
00:10:36Your shower curtain sometimes looks a little too sticky when you enter your bathtub to wash.
00:10:41This is because of the shower curtain effect.
00:10:44Hot water lowers the air pressure behind the curtain.
00:10:47The higher and denser pressure outside pushes the curtain inward, which gives you the impression that your curtain loves you a lot.
00:10:55If you take a closer look at an ordinary trash bag, you will probably notice that its seam is upside down.
00:11:01In fact, you are not supposed to shake the bag to open it.
00:11:04You have to place it on top of your trash like a hat, then simply push it in the middle.
00:11:10This way, the seam will be where it should be, inside.
00:11:15If you often have trouble getting your chocolates out of their box, pay attention to the little holes around them.
00:11:20They are there to help you.
00:11:22If you push one of these holes, your chocolate will come out as it is.
00:11:26This hole in the upper part of your sink has several hidden functions.
00:11:30First, if someone forgets to close the tap, the water will not overflow and your bathroom will not be flooded.
00:11:37Secondly, thanks to this hole, your sink empties more quickly because it allows the air to escape, which favors the flow.
00:11:45The button on top of your cap is there only for aesthetic purposes.
00:11:49But did you know that this little thing has a name?
00:11:51Professionals in the United States call it a Squatcho.
00:11:54Its initial function was to hold together the four sides of the cap.
00:11:58But as the manufacture of these hats improved over time, the button became useless and the Squatcho simply disappeared.
00:12:05But the caps were no longer as pretty.
00:12:07Shortly after, the Squatcho came back.
00:12:09And I think he's here to stay.
00:12:11Originally, high-heeled shoes were not intended for gala and end-of-year balls.
00:12:16In the 10th century, riding on horseback was quite difficult with flat-soled shoes.
00:12:21And the horsemen's feet were constantly slipping from the calves.
00:12:24The invention of high heels allowed to solve this problem.
00:12:27They held much better in the saddle thanks to them, and then they gained in popularity.
00:12:31It did not take long for them to become a fashion accessory to match the most elegant outfits.
00:12:36The important personalities no longer wanted to be seen in society with flat shoes.
00:12:40Riding on horseback with high heels was a bit like owning a luxury sports car today.
00:12:45At first, heels were mostly worn by men.
00:12:48But the ladies adopted this emblematic fashion from the 17th century.
00:12:52Since then, it is one of the greatest successes in history in terms of clothing style.
00:12:56In ancient Rome, the saddle was so precious that people even gave it the name white gold.
00:13:00With the torrid heat that reigned and especially the absence of refrigerators,
00:13:04its purpose was to preserve food, mainly meat and fish.
00:13:08In addition, it made all these things much tastier.
00:13:11Sal, which means salt in Latin, was also used in exchange for money to pay the workers.
00:13:17And that's where the word salary comes from.
00:13:19Rice is the oldest food cultivated in the history of humanity.
00:13:23It was, about 15,000 years ago, a wild herb from a small valley in Southeast Asia.
00:13:29Today, it is used all over the world as a staple food and 3.5 billion people eat it regularly.
00:13:35It is difficult to imagine a world without these video calls that you pass through the camera of your phone or computer.
00:13:42This technology has allowed innovations that have changed our lives, such as working from home.
00:13:47However, at first, video calls were not at all intended for the use we make of them today.
00:13:52This technology was introduced to find out if there was still coffee left in the coffee maker.
00:13:56In 1993, researchers from the University of Cambridge, frustrated to always find that their coffee maker was empty when they wanted to take a coffee break, decided to find a solution.
00:14:06They therefore invented a coffee maker monitoring device by connecting a camera that transmitted a real-time image to their computers.
00:14:14Thanks to these researchers, we can now work in pajamas.
00:14:17We know several of Albert Einstein's discoveries.
00:14:20But there is something you probably haven't heard of.
00:14:23With one of his students, he invented a modified refrigerator.
00:14:27It has nothing to do with what we use.
00:14:29In the 1920s, refrigerators were not very safe, because they produced toxic gases.
00:14:34He wanted to create a less dangerous version, which would not require electricity, without mobile parts, and which would only need a source of heat to work.
00:14:42Unfortunately, they failed to raise the necessary funds and the project fell through.
00:14:47In the 1950s, electric refrigerators became popular.
00:14:51But in 2008, engineers from the University of Oxford decided to take a second look at this invention.
00:14:57They are still working on it, but once they have finished, the Einstein refrigerator will be very useful in rural areas without electricity, and for those who want to live far from everything.
00:15:07The QWERTY keyboard model, widespread in many countries, is not the easiest to use.
00:15:12In the 1870s, Christopher Charles invented a keyboard designed to make typing twice as fast.
00:15:19But by placing the most commonly used letters next to each other, typing turned out to be a little too fast, and the machines were constantly blocking each other.
00:15:26He therefore developed the QWERTY model.
00:15:28This forced the fingers to type more slowly.
00:15:30They had to first look for the letter, then type it with their index finger.
00:15:34This keyboard is still in use today, and people have gotten used to it.
00:15:38The plastic end of your laces is called an aglet, and has been used since ancient Rome.
00:15:43Of course, there was no plastic at the time, so these aglets were made of stone, glass or metal.
00:15:50The richest people could, if they wanted, decorate their shoes with precious metals such as brass or silver.
00:15:56What came first, television or remote control?
00:16:00Well, know that the technology that makes remote control work is several decades older.
00:16:06In 1898, Nikola Tesla created a machine to control remote devices using radio waves.
00:16:13And to sell his invention, he made a remote-controlled model of a boat.
00:16:17But it didn't interest anyone.
00:16:19He was ahead of his time.
00:16:21Remote control was finally used for televisions in 1956.
00:16:26The engineer Percy Spencer accidentally invented something great in 1945.
00:16:32He was working on a new vacuum tube, the magnetron, which was to be used on radar systems.
00:16:37As he was working on his project, he noticed that the chocolate he had in his pocket had melted.
00:16:42Realizing that the magnetron had the ability to heat food, he made a test with corn, and he got popcorn.
00:16:49He then tried to test it with eggs, but things didn't go very well.
00:16:53So he built a metal box, and the first microwave oven was born.
00:16:58In 1733, an English duke asked William Kent, an architect, to make him a means of transport for his children.
00:17:05William built the very first pushcart, but no one was supposed to push it.
00:17:10Without a handle, it looked like a cart and was pulled by a goat or a little pony.
00:17:14A very small number of these pushcarts were made at the time, because they were expensive.
00:17:18More than 100 years later, in 1848, the first pushcart with handles was invented and put on the market at an affordable price.
00:17:26We often associate, because of the movies, the policemen and the bathers.
00:17:30And there is actually a reason for that.
00:17:32In the 1950s, in the United States, night shift workers often had trouble finding an open space to pay for a small midnight snack.
00:17:40At that time, bath shops were family businesses.
00:17:43They worked hard all night, making fresh baths to sell the next day.
00:17:47And as these shops were often victims of robbery, a relationship that still persists was then created.
00:17:52The policemen had something delicious to put under their teeth, and the bathers felt safe during the night.
00:17:58Breaking bubble wrap is really a relaxing activity.
00:18:01And of course, this material is also very useful to protect fragile objects.
00:18:06In 1957, two engineers had fun gluing together two shower curtains by imprisoning the air bubbles between the two surfaces.
00:18:13This is how the first bubble wrap was made.
00:18:16But what they were trying to invent was a new type of wallpaper.
00:18:20Unfortunately, their product was not successful on the market.
00:18:23Some time later, they tried to sell it as insulation for the greenhouse.
00:18:26And once again, they failed.
00:18:28Everything changed in 1960, when IBM began to ship very fragile computer parts.
00:18:34Bubble wrap was perfect, and it still collaborates to this day.
00:18:37The next time you receive a package in your mail, take a look at the cutter.
00:18:41If it has diagonal lines on the blade, you will be able to benefit from a small advantage in terms of design.
00:18:47It turns out that these are blades that break.
00:18:50Continuously cutting cardboard can wear out the sharp edge of the blade.
00:18:53To avoid having to buy a brand new cutter, the upper segment of the next line can break to obtain a new super-sharp edge.
00:19:01To do this, look at the small hole at the base of the tool, sometimes called the blade breaker.
00:19:07The people who came up with this brilliant invention are engineers who were inspired by the way chocolate bars are divided.
00:19:15Wait a minute, don't throw away this cardboard package right away.
00:19:18It is very likely that you have bags of silica gel somewhere at the bottom of the box.
00:19:23As this gel is a drying tool, it absorbs the humidity of its environment, so that you can keep these bags for other occasions.
00:19:31If you need to dry your phone or another electrical object, you can place it in a container next to the silica gel to reduce damage.
00:19:39No need to be a mechanic to know when the tires of a standard car must be replaced, because they are equipped with a well-designed indicator.
00:19:47If you look closer, you will see that the tire bands are made up of a pile of rubber notches.
00:19:53When the marks are equal to the perpendicular bars, this is the sign that you must make an appointment with your local car service,
00:20:00because it is very likely that the tires have lost most of their traction and that they are no longer safe for driving.
00:20:07The upper corners of the windshield of a car have textured black dots integrated at the edge of the glass.
00:20:13This detail is not there for design reasons.
00:20:16It is a coated coating, which means that a special type of ceramic paint is added to the glass to protect its sealant from UV rays.
00:20:25It also allows you to conceal and create a coarser surface for the glue used to put the glass in place.
00:20:32Every time you hit the road, check if there is a small bar under the rearview mirror of your car.
00:20:37I bet you didn't know it was there to help you switch from day vision to night vision.
00:20:43It uses a prismatic glass technology to blur the reflection and reduce the glow of the headlights behind you in traffic.
00:20:51These manual rearview mirrors were invented in the 1930s, but they became the norm in the 1970s.
00:20:59When you are in the car, take a look at the headrests, because you probably don't know they have a hidden function.
00:21:05Of course, they can be adjusted to suit all sizes of passengers, so that they benefit from adequate support for their head and neck.
00:21:12The hidden feature is that they are detachable and have two very solid metal bars.
00:21:18If you ever get stuck in a car and have to run away quickly, these bars can be very useful to break the car's windows.
00:21:26So, you're driving around and suddenly you run out of gas.
00:21:31What I'm going to describe to you looks more like a joke than a real situation that could happen.
00:21:37But what happens if you are in such a hurry that you accidentally leave with the gasoline gun still in the tank?
00:21:44Well, the guns were designed to avoid any risk.
00:21:48Don't worry, they have a separation device that allows the pipe to be detached when it is removed with sufficient force.
00:21:56Initially designed at the beginning of the 20th century to be worn exclusively by basketball players,
00:22:02sneakers have quickly become one of the essential elements of fashion, just like jeans and leather jackets.
00:22:09If you look at them closely, you will see that they have two additional holes on the side, similar to shoe laces.
00:22:16They are made like this not only to provide additional ventilation,
00:22:20but also to allow people to be more creative with their laces when they wear their shoes.
00:22:25Admit it, you always thought that the bars were joined at one end in order to keep them together until you were ready to start your meal.
00:22:34This may not be quite true.
00:22:36If we look at them more closely, it turns out that these wooden tools have a square-shaped end.
00:22:42The chopsticks made in this way are from an old Japanese traditional design that allows you to easily break the ends.
00:22:49The separated end can then be used as a support for the chopsticks in order to keep them cleaner,
00:22:55in the hope that they can be reused since they will not touch the table or any other surface.
00:23:01Women's bikes have a special design that surprisingly has a historical and fashionable function.
00:23:07The lower frame is largely intended to compensate for the generally smaller size of women compared to that of a normal man.
00:23:14If this is the case for the handlebars and the saddle, the general frame is lower for an additional reason.
00:23:20At a time when women wore long skirts and dresses all day, every day they had to make sure that their outfits would not get stuck in the frame.
00:23:27This is how we designed a bike with a lower frame, perfectly suited to women and their needs of the time.
00:23:34The fact that toothpaste is multi-colored is not just a nice advantage to make dental hygiene more fun.
00:23:40There is a secret explanation for each of the colors, dating back to the 1970s.
00:23:46At that time, people were increasingly interested in their oral dental health,
00:23:51and were therefore looking for products that could do more than just brush their teeth.
00:23:56A company was the first to do it by adding a mouthwash to its toothpaste, i.e. the blue strip.
00:24:02It then added the red strip, intended to contain ingredients that help you take care of your gums.
00:24:08So you're hungry, but you don't really want to have a dessert-flavored meal.
00:24:13What would you say to instant noodles instead?
00:24:16At the end, your stomach is growling, but there is a problem.
00:24:20The polystyrene cup is broken and the noodles are outside.
00:24:24Wait, what is this space at the bottom of the cup? But why?
00:24:29This space is intended to protect the noodles.
00:24:31It is not the company that is trying to save money or anything like that.
00:24:35Notice how the ramen in the cups is almost never broken,
00:24:39while the one in the package comes out in poor condition.
00:24:42This technique is called an intermediate suspension.
00:24:45The noodles are tightened to prevent them from being crushed in the delivery truck.
00:24:50It's not just to make the noodles look beautiful and long.
00:24:53It is also about making sure that these delicious noodles are softer and more regular.
00:24:59Morning wool is not the best.
00:25:01Fortunately, there is an easy way to get rid of it.
00:25:04Obviously, everyone thinks that the mouthwash was invented to ...
00:25:08wash your mouth.
00:25:10Well, no.
00:25:11The mouthwash was originally invented and sold as a floor cleaner.
00:25:15It was sold to hospitals as an antiseptic for years,
00:25:19but it never really took off.
00:25:22A marketing genius renamed it mouthwash.
00:25:25The rest is fresh and menthol story.
00:25:28So, after cleaning your teeth,
00:25:30do not forget that sometimes repositioning a brand can be very effective.
00:25:36It is difficult to imagine a world without the Internet nowadays.
00:25:39No streaming, no online games, no pictures of cute kittens.
00:25:44Yeah, I know that's not why it was designed, but who cares, right?
00:25:49The Internet prototype was called ARPANET,
00:25:52acronym for Advanced Research Projects Agency Network.
00:25:59This machine was very sensitive.
00:26:01To prevent anyone from turning it off,
00:26:03an intelligent scientist glued a piece of paper on it with its striking words.
00:26:08This machine is a server.
00:26:10Do not turn it off.
00:26:12It was written in red ink, nicely drawn.
00:26:15The fact that your teacher scribbles in the margins of your notebook is not really new.
00:26:19Except that the margins were not designed for that.
00:26:22It's a protection against rats.
00:26:24At the time, rats were constantly nibbling on paper.
00:26:27So if you wrote something on the edge of the sheet,
00:26:30well, it ended up in the stomach of a hungry rat.
00:26:34A few well-placed margins prevented your best answers from being eaten.
00:26:39Hey, I can't finish this pizza.
00:26:41It's time to cover up the leftovers.
00:26:43Fortunately, I have a lot of plastic film.
00:26:46A little pull, and the roll comes off.
00:26:49Cool!
00:26:51If you look at the packaging, this long and thin box,
00:26:54there is a little peculiarity that can help you.
00:26:57A cardboard tab at each end.
00:26:59Push them inwards, and the roll will no longer be able to move.
00:27:03It's strange that I've never seen them before.
00:27:07It's lunchtime.
00:27:08I feel like a California Roll today.
00:27:11Algae, rice, cucumbers, avocados, and crab meat.
00:27:14Or is it...
00:27:15In fact, it's imitation crab meat.
00:27:18It's basically good white fish mixed with sugar.
00:27:22The fish mixture is then heated and shaped.
00:27:25It's delicious.
00:27:28Maybe that's why it's called the hot dog of the sea.
00:27:31No, I just made that up.
00:27:35Your microwave has a secret that we've all seen,
00:27:38but we've never paid attention to.
00:27:40This black net you see on the door is a Faraday cage.
00:27:44It prevents electromagnetic energy, or microwaves, from escaping
00:27:48and from cooking you at the same time.
00:27:51That's how they heat up food so quickly.
00:27:54Each microwave must have one, and they're all of different qualities.
00:27:58This Faraday cage can even stop the signals on your phone,
00:28:02which is certainly useful.
00:28:04And you don't need your popcorn to stop swelling
00:28:07to be able to make a call, do you?
00:28:09For that, airplane mode is much easier to handle.
00:28:13Have you ever taken a IQ test
00:28:15and realized you had Einstein's IQ?
00:28:18No? Me neither.
00:28:20The average IQ is not 100.
00:28:22And there's very little evidence that Einstein never took the test.
00:28:26At first, most people thought the tests were too vague
00:28:30to be used for anything.
00:28:32This test was designed for children who needed help with their studies.
00:28:36Later, they realized it could be adapted to measure intelligence.
00:28:40But at first, they didn't aim for that goal.
00:28:43Have you ever blown up bubble wrap?
00:28:46No? You're missing something.
00:28:48And of course, you guessed it,
00:28:50it was never designed to be blown up or used as we do today.
00:28:55It was invented as new textured paper.
00:28:58It was by sealing two shower curtains together that they created the first bubbles.
00:29:03Einstein obviously never really found his audience.
00:29:06After failing as a bubble wrap designer,
00:29:08he discovered the true meaning of his life.
00:29:11This bubble wrap could protect fragile objects.
00:29:14When the first computers were shipped,
00:29:16bubble wrap was there to protect them.
00:29:19Would you find that cool or not?
00:29:21Leave me a comment below.
00:29:23If you owned one of the world's largest companies
00:29:26selling one of the most famous products on the planet,
00:29:29how would you keep your company's secret?
00:29:32Coca-Cola's formula isn't even patented.
00:29:35The first recipe was, but when they made changes,
00:29:38no patent was ever filed.
00:29:41The secret formula is only known to a few people in the company.
00:29:45That said, even Coca-Cola's rival doesn't want this recipe.
00:29:49In 2006, an unhappy employee tried to sell the secret,
00:29:53but he couldn't find a buyer.
00:29:56Hey, look at your brand new mattress.
00:29:58You see the label,
00:30:00don't take it off for legal reasons.
00:30:02This thing looks pretty serious.
00:30:04But good news, the labels aren't for you.
00:30:07They're for the mattress' seller.
00:30:10100 years ago, mattress manufacturers
00:30:12made their fillings with practically anything.
00:30:15Animal fur, old hospital beds, or even clothes.
00:30:19Then, strict laws prevented the use of these weird materials.
00:30:24The hospital beds were filled with germs.
00:30:27Yuck!
00:30:29In the rain, the molded dough is full of water,
00:30:32perfect for taking care of the house.
00:30:34Mix flour, water, salt, food coloring,
00:30:38and voila!
00:30:40Any creative person can have fun with it for hours.
00:30:44Good price, clean, non-toxic, perfect molded dough.
00:30:48But it was never designed for that.
00:30:51It was originally designed to clean the walls in the 1930s.
00:30:55People started going crazy with wallpaper,
00:30:58and couldn't use water or soap on it.
00:31:01In the end, Play-Doh found new functions
00:31:05and did really well.
00:31:07Have you ever finished a sock
00:31:09and noticed a hole in the little stick?
00:31:12This hole isn't just decorative.
00:31:14And no, it wasn't designed to turn into a musical instrument.
00:31:18It's there to prevent this delicious sweet treat from falling.
00:31:22When the candy is still hot, it's poured into a mold.
00:31:25The candy flows into the hole,
00:31:27and when it hardens, it creates an anchor.
00:31:30You don't like socks?
00:31:32Then why not some good old American gummy bears?
00:31:35Unfortunately, they're not American at all.
00:31:38They're German.
00:31:40A German company started making them in 1922.
00:31:44The original name was...
00:31:46Gummy...something.
00:31:48They were inspired by real bears dancing in shows.
00:31:52These treats ended up going around the world.
00:31:55Have you ever wondered what these little bumps on the F and J keys of your keyboard were for?
00:32:00These little rags are there to help your fingers
00:32:03get to the best spot possible to hit the lightning fast.
00:32:07Keep your fingers on the F and J keys.
00:32:10This will make it easier for you to reach all the keys.
00:32:13Especially if you don't look at the keyboard.
00:32:16Today, everyone loves Slinky.
00:32:19If you've ever seen one wobble down the stairs
00:32:22with a groovy music in the background,
00:32:24bravo, you're really a YouTube fan.
00:32:28It was a huge success as soon as it came out.
00:32:31Which is crazy, because it was never designed like a toy at all.
00:32:35It's a spring.
00:32:37It was originally designed to stabilize the ship's sensitive nautical devices.
00:32:42So it's not a fun feature at all.
00:32:45And yet, one day, one of them fell off a table
00:32:48and danced all the way to our hearts.
00:32:50After many experiments,
00:32:52the improved Slinky was born.
00:32:54Let's give this team of scientists a medal.
00:32:57The expiration date on bottles
00:32:59doesn't concern the expiration of water itself.
00:33:02Water doesn't expire, but the bottle does.
00:33:05Over time, plastic releases dangerous chemical products.
00:33:09The paint you see in the cream or lipstick caps
00:33:12is used to break the protective film of the tube.
00:33:14No need to cure your teeth or damage your nails to try to open it.
00:33:18The post-its must be unsticked on the side,
00:33:21as if you were turning the pages of a book.
00:33:23Most people take them off from the bottom to the top,
00:33:25but that folds them and makes them less sticky.
00:33:28To prevent the boiling water from overflowing,
00:33:30just put a wooden spoon on the pan.
00:33:33It only works for a while.
00:33:35As soon as the spoon reaches the boiling point,
00:33:37the bubbles will increase and overflow.
00:33:39That's why metal spoons don't work.
00:33:42They heat up too quickly.
00:33:44Some gums have two colors and two textures.
00:33:47It's not for pencils and pens.
00:33:49It's for different types of paper.
00:33:51Most people use hairpins in the wrong way.
00:33:55The zigzag part must be placed against the scalp.
00:33:58This particular shape will hold the hair and the pin in place
00:34:02and spend two seconds of the lake on the pins before putting them on.
00:34:07Have you noticed this second little hole in the lid of your coffee pot?
00:34:11It's there to control the release of the liquid.
00:34:13Without this little hole,
00:34:15the boiling coffee would spread in any way, as we know.
00:34:18It also allows the steam to escape,
00:34:20so that the heat and pressure don't melt or explode the lid.
00:34:25The apples you buy at the supermarket
00:34:27were probably harvested between August and November.
00:34:30Then they were covered in wax,
00:34:33dried in hot air and stored in cool places.
00:34:36Fruits take between 6 and 12 months to ripen
00:34:39and end up in the supermarket shelves.
00:34:42Sometimes you have to move away from your computer,
00:34:45but you don't want to constantly have to reconnect.
00:34:48Put your mouse on an analog watch.
00:34:50The mouse will distinguish the movement of the scooter
00:34:53and your computer won't notice.
00:34:55Instant rice tends to overflow everywhere in the microwave.
00:34:59And you've probably already had a hard time keeping the package straight.
00:35:03It turns out that the folds that unfold from the bottom
00:35:06create a stable and solid base.
00:35:08Push them outwards and give it a try.
00:35:11But why don't we learn that at school?
00:35:14This 2.5-liter soda left over from the pizza party
00:35:17doesn't have any bubbles anymore.
00:35:19Instead of pouring it into the toilets,
00:35:21add it to your compost pile.
00:35:23Sugar nourishes the microorganisms
00:35:25and increases the acidity of the compost,
00:35:27which helps the organic matter to decompose more quickly.
00:35:32Scissors' blades end up frothing sooner or later,
00:35:35but it's not permanent.
00:35:37There's an article in your kitchen that can help you
00:35:39bring them back to life.
00:35:41And quickly.
00:35:42Aluminum foil is not only intended for the rest of the lasagna.
00:35:46Fold a sheet in four and start cutting it.
00:35:50Cutting through the aluminum foil will sharpen your scissors,
00:35:53except if they are really too frothed.
00:35:56So save the time, it's still time!
00:35:58These little brushes on the sides of the escalators
00:36:01are not there to clean your shoes,
00:36:03even if they can actually fill this function quite well.
00:36:06These hairs are actually an important element of safety.
00:36:10Without them, the clothes, the laces,
00:36:12the shoulder straps of the bag could get stuck
00:36:14when they are too close to the sides.
00:36:17The little brushes are also there to tickle you
00:36:19to remind you to lower your eyes and be careful.
00:36:23What can half-belts be used for on jackets?
00:36:27Well, some military jackets also served as a cover.
00:36:31And the half-belt prevented the additional fabric
00:36:34from disturbing the soldier.
00:36:36Today, they are mostly used as a fashion accessory.
00:36:40Even if there is worse in life,
00:36:42accidentally engraving the wrong pages is quite annoying.
00:36:45Especially if the engraver carries with it
00:36:47a huge piece of your document
00:36:49when you try to remove it.
00:36:51There is actually a simple way to make sure
00:36:53that the engraving brushes are less tight
00:36:55and easier to remove.
00:36:57Take a closer look at this metal plate
00:36:59at the front of your engraver,
00:37:01called the anvil.
00:37:03Turn the engraver over and adjust the settings.
00:37:05You can put your engraver in temporary mode.
00:37:08No more worries!
00:37:10Toilet covers have been used wrongly all this time.
00:37:14If you are used to tearing this flap
00:37:16that looks like a tongue, you are wrong.
00:37:18Instead of tearing it,
00:37:20let the flap rest in the bowl
00:37:22after you have placed the cover.
00:37:24When you pull the water hose,
00:37:26the suction will pull on the flap
00:37:28and carry the cover.
00:37:30What does this square or black rectangle
00:37:32at the end of your toothpaste tube symbolize?
00:37:34Is there a color code to indicate
00:37:36the ingredients in it?
00:37:38Or does it indicate whether the toothpaste
00:37:40is synthetic or natural?
00:37:42Well, sorry, but the truth is not that exciting.
00:37:45This marking is there for the assembly machines.
00:37:47It helps them to know where to cut
00:37:49and fold each tube.
00:37:51We have all already returned
00:37:53from the supermarket by car,
00:37:55we took a right turn a little too hard
00:37:57and BADABOOM!
00:37:59It looks like a race bag volcano
00:38:01has just erupted in the trunk.
00:38:03So look carefully in your trunk.
00:38:05You may see little hooks inside
00:38:07that you can hang your bags on.
00:38:09Some cars have them rather behind the front seats.
00:38:12You can use them to hang clothes
00:38:14or your food to carry.
00:38:16You may have noticed that air hostesses
00:38:18like to touch the upper compartments
00:38:20when they walk in the aisle.
00:38:22It's not a joke.
00:38:24There are actually handles along the edges
00:38:26to give them a better grip
00:38:28while they walk.
00:38:30Do not hesitate to grab it the next time
00:38:32you want to take a walk in the air.
00:38:34It's definitely better than grabbing
00:38:36the passengers' headrests.
00:38:38A brass door handle just adds
00:38:40what you need to shine at your front door,
00:38:42but it's not its only use.
00:38:44Brass, like everything
00:38:46that contains an alloy of copper,
00:38:48has antimicrobial properties
00:38:50that many germs and harmful
00:38:52bacteria cannot stand.
00:38:54In very crowded places,
00:38:56these brass buttons and handles
00:38:58are the ideal way to get rid
00:39:00of the bad germs
00:39:02without having to use
00:39:04aggressive chemicals all the time.
00:39:06The only drawback is that
00:39:08brass is much more expensive
00:39:10than other metals.
00:39:12Do you see the blue hairs pattern
00:39:14in the middle of the white hairs?
00:39:16It certainly makes your brush
00:39:18much prettier,
00:39:20but it's not just aesthetic.
00:39:22These hairs have a practical function.
00:39:24The blue dye is designed to
00:39:26tell you that it's time
00:39:28to change your toothbrush.
00:39:30Anyway, it's good to change
00:39:32every three or four months,
00:39:34but these blue hairs are there
00:39:36to remind you, just in case
00:39:38you forget.
00:39:40There are many reasons
00:39:42why the caps of the mouths
00:39:44of geese are always round.
00:39:46In past civilizations,
00:39:48such as Ancient Rome,
00:39:50these caps were square-shaped
00:39:52stone slabs.
00:39:54But all these stops
00:39:56and interstices
00:39:58led to many nicks,
00:40:00jams and accidents
00:40:02for the Romans without
00:40:04doubt.
00:40:06The round lid
00:40:08is a Scottish scientific invention,
00:40:10but not to keep your coffee hot.
00:40:12He just wanted to keep
00:40:14some chemical products
00:40:16at a stable temperature.
00:40:18He placed a small bottle
00:40:20inside a larger one,
00:40:22then sucked the air
00:40:24between the two bottles.
00:40:26This same technique
00:40:28is used to make
00:40:30the modern thermos.
00:40:32You can find a pinball
00:40:34in about every house
00:40:36but after all, strawberries
00:40:38do not grow on tomatoes.
00:40:40This little accessory is for the needle
00:40:42that you use at the moment
00:40:44so as not to lose it
00:40:46among all the others.
00:40:48Sticky deodorants seem to be finished
00:40:50when the plastic begins
00:40:52to rub against your skin.
00:40:54But there is still a lot left in there.
00:40:56Here is an easy trick
00:40:58to get it out.
00:41:00Unscrew the bottom
00:41:02and push it up
00:41:04until it comes out
00:41:06of the service station
00:41:08with the hose still stuck
00:41:10in the tank.
00:41:12Fortunately, the gas stations
00:41:14have found a solution.
00:41:16They have developed
00:41:18a magnetic connector
00:41:20that disengages
00:41:22when you pull it.
00:41:24The next time you get dressed,
00:41:26look closer at your shirt.
00:41:28Each buttonhole is sewn vertically
00:41:30but look at the very last hole.
00:41:32This is where your hips are.
00:41:34This buttonhole is not designed
00:41:36like this by chance.
00:41:38It prevents your shirt from tearing
00:41:40when your hips move.
00:41:42The layer of foam that forms
00:41:44when you put foam bath
00:41:46in your bathtub is not just fun.
00:41:48It also acts as an insulator
00:41:50and keeps your bath warm longer.
00:41:52The pompom on the top of your hat
00:41:54was not placed there just to look pretty.
00:41:56Originally, it was sewn
00:41:58on the sailors' hats
00:42:00and on the ceilings
00:42:02often too low for the ships.
00:42:04The cracker holes were drilled
00:42:06to prevent them from breaking
00:42:08or cracking during cooking.
00:42:10If these holes didn't exist,
00:42:12the steam would accumulate
00:42:14inside and break them.
00:42:16The numbers on the stickers
00:42:18that you find on oranges
00:42:20are not placed randomly.
00:42:22If there are four numbers
00:42:24and the first one is 3 or 4,
00:42:26it means that the fruit
00:42:28is genetically modified.
00:42:30If there are five numbers
00:42:32and the first one is 9,
00:42:34it means that the fruit is organic.
00:42:36The margins on the pages
00:42:38are not just used to take notes,
00:42:40but were originally used as protection.
00:42:42At the time, rats were very present
00:42:44in houses and paper was one
00:42:46of their favorite food.
00:42:48The margins were added
00:42:50so that the rats blinked
00:42:52white areas rather than
00:42:54those containing important writings.
00:42:56You don't feel bad for anything,
00:42:58just like the seasoning jars
00:43:00in fast food.
00:43:02These cardboard boxes
00:43:04can be unfolded to form a plate
00:43:06of suitable size for your dish.
00:43:08The long neck of your soda bottle
00:43:10is designed to encourage you
00:43:12to hold it there.
00:43:14Thus, the heat of your hand
00:43:16will only warm up the upper part
00:43:18of the bottle instead of
00:43:20warming up all your drink.
00:43:22Why do the back of some jackets
00:43:24have a corresponding button
00:43:26so that the person wearing them
00:43:28can raise their collar
00:43:30and attach it around the neck
00:43:32to make it warmer?
00:43:34With time, people stopped doing it
00:43:36and this button was removed,
00:43:38but many manufacturers
00:43:40have kept this buttonhole by tradition.
00:43:42It is always difficult to see
00:43:44food in the microwave
00:43:46because of this black grid
00:43:48glued to the glass,
00:43:50but it is there to protect you
00:43:52from the image.
00:43:54It is there so that you can
00:43:56pass cords through the holes
00:43:58to transport additional equipment.
00:44:00It is ideal for camping
00:44:02or long hikes.
00:44:04The golf balls are covered
00:44:06with small holes
00:44:08so that you can fly more easily
00:44:10in the air.
00:44:12This reduces the resistance
00:44:14and allows them to travel
00:44:16further and faster.
00:44:18The cotton of the make-up
00:44:20The donuts are pierced
00:44:22so that the inside and the outside
00:44:24cook evenly.
00:44:26Before the addition of these holes,
00:44:28the inside was often greasy and doughy
00:44:30while the outside was crispy.
00:44:32The charger of your portable mac
00:44:34is equipped with small legs
00:44:36but not to stand it up.
00:44:38When they are unfolded,
00:44:40these legs allow you
00:44:42to wrap the cable around
00:44:44and keep it in place
00:44:46to prevent it from getting in
00:44:48This disc allows you to seal
00:44:50the bottle hermetically
00:44:52so that the gas does not escape.
00:44:54The holes in the sucker sticks
00:44:56are not intended to prevent suffocation
00:44:58in case of ingestion.
00:45:00They are there to keep the donut in place.
00:45:02The excess liquid flows
00:45:04into the tube through this hole
00:45:06and when it hardens,
00:45:08it fixes the sucker.
00:45:10If the stick was smooth,
00:45:12the donut would slide too easily.
00:45:14The leather jacket closure
00:45:16has a fashionable effect.
00:45:18Vertically sewn closures
00:45:20can be rolled up when you lean forward
00:45:22but not a diagonal closure.
00:45:24The small triangle on your gas gauge
00:45:26tells you which side of the car
00:45:28the gas hatch is on.
00:45:30You will never stop on the wrong side
00:45:32of the pump now.
00:45:34The vacuum cleaners are equipped
00:45:36with many accessories
00:45:38but do you really know what the one
00:45:40with long hair is for?
00:45:42It is used to clean dust
00:45:44These small holes in the chocolate box
00:45:46have a function.
00:45:48Press on the hole near the donut
00:45:50and it will come out
00:45:52without your fingers getting dirty.
00:45:54Some skyscrapers have
00:45:56completely empty floors.
00:45:58It is a way to get around
00:46:00the height limits.
00:46:02Most buildings have a limited number
00:46:04of floors.
00:46:06As these invisible floors are empty,
00:46:08they add height to the building
00:46:10and make it more impressive
00:46:12These empty floors
00:46:14also prevent the spread
00:46:16of fires.
00:46:18Women's shirt buttons
00:46:20are traditionally placed on the left
00:46:22for a good reason.
00:46:24At the time, it was a sign of wealth
00:46:26because it meant that a servant
00:46:28you had dressed and had the buttons
00:46:30on the left allowed her to button
00:46:32the shirt more easily.
00:46:34Your cuticles are useful
00:46:36so think well before getting rid of them.
00:46:38This little skin area is there
00:46:40to prevent bacteria and fungi
00:46:42from infiltrating.
00:46:44What is the difference
00:46:46between a wooden belt
00:46:48and a plastic belt?
00:46:50In addition to helping
00:46:52to keep your clothes in shape,
00:46:54cedar wooden belts
00:46:56repel mites and insects.
00:46:58If you look carefully
00:47:00at an elevator door,
00:47:02you will see a small hole.
00:47:04It is actually a lock hole
00:47:06used for maintenance
00:47:08to prevent tears
00:47:10due to tension or movement.
00:47:12Workers at construction sites
00:47:14are usually dressed in orange
00:47:16because this color is visible
00:47:18even in bad weather.
00:47:20It is the most effective color
00:47:22to attract attention
00:47:24and alert people.
00:47:26No wonder that many security vests
00:47:28and warning cones
00:47:30are also orange.
00:47:32The stop sign has an eight-sided shape
00:47:34to help drivers recognize it easily
00:47:36and to prevent them from confusing
00:47:38the stop sign with any other at night.
00:47:40Rugged bands on the side of the road
00:47:42are placed there to alert drivers
00:47:44who lean against the wheel.
00:47:46When the tires pass on these bands,
00:47:48the noise and vibrations
00:47:50work like an alarm clock.
00:47:52There are magnetic locks
00:47:54on the fuel pumps
00:47:56in service stations
00:47:58in case someone leaves
00:48:00with the gasoline gun
00:48:02still attached to his tank.
00:48:04The fuel pump can't mix with water
00:48:06because of the water puddle.
00:48:08It forms a thin membrane on top.
00:48:10When the light is reflected on it
00:48:12and on the water at the same time,
00:48:14you get a rainbow.
00:48:16The triple handle of a jerry can
00:48:18is there to allow two people
00:48:20to carry it more easily
00:48:22and to distribute the liquid uniformly.
00:48:24The gas cans often have a second hole
00:48:26which must also be unlocked
00:48:28before pouring the liquid.
00:48:30The passage of air will prevent it
00:48:32from sticking.
00:48:34Most gas cans have two holes
00:48:36with caps, one bigger and one smaller.
00:48:38You're supposed to unlock the smaller hole
00:48:40before pouring the liquid
00:48:42through the bigger one.
00:48:44This will prevent the liquid from sticking
00:48:46and from spreading on your clothes
00:48:48and on the floor.
00:48:50Another little thing we often neglect
00:48:52is the tip of a cap.
00:48:54Most tubes are usually sealed
00:48:56with a plastic film or an aluminum sheet
00:48:58and opening it with your nails
00:49:00allows you to easily open
00:49:02even the most tightly sealed tube.
00:49:04You can use most screwdrivers
00:49:06with a wrench to create more torque.
00:49:08Just place the wrench
00:49:10on the handle of the screwdriver.
00:49:12This way, you'll need to apply
00:49:14much less force than usual.
00:49:16You'll also be able to reach
00:49:18difficult areas more easily.
00:49:20Cameras are installed in shops,
00:49:22banks and hospitals to monitor everything.
00:49:24If something happens,
00:49:26you can call the police or the ambulance.
00:49:28Cameras help solve a lot of problems.
00:49:30So why aren't there cameras
00:49:32in planes?
00:49:34The crew keeps order in the plane
00:49:36but they can't do anything
00:49:38if something serious happens.
00:49:40Plus, there's nowhere to hide in a plane.
00:49:42During the flight,
00:49:44cameras are useless
00:49:46and after the flight,
00:49:48passengers' statements work as well as cameras.
00:49:50So if cameras are useless,
00:49:52why spend money on them?
00:49:54Water is very easy to clean
00:49:56because it's a triangular molecule
00:49:58made up of an oxygen atom
00:50:00and two hydrogen atoms,
00:50:02hence the H2O.
00:50:04These molecules have slightly different charges
00:50:06on their opposite sides,
00:50:08a bit like magnets.
00:50:10That's why water easily attaches
00:50:12to other molecules,
00:50:14including those that make up saline.
00:50:16Many individual houses
00:50:18have triangular roofs
00:50:20because it allows rain,
00:50:22snow and dead leaves
00:50:24to fall.
00:50:26When a storm approaches,
00:50:28clouds seem to become dark.
00:50:30But it's just an illusion.
00:50:32The thin clouds of a sunny day
00:50:34easily let the light through.
00:50:36They also diffuse all the colors
00:50:38of the light spectrum.
00:50:40This makes us perceive the clouds
00:50:42as being white.
00:50:44The thicker the clouds are
00:50:46and contain droplets of water,
00:50:48the less they let the light through
00:50:50and the darker they seem.
00:50:52These metals have an anti-germ effect.
00:50:54Bacteria spread much more slowly
00:50:56on them.
00:50:58They also get rid of microbes
00:51:00quite quickly, in a few hours.
00:51:02But that doesn't mean
00:51:04you shouldn't wash your hands.
00:51:06Diamonds have symmetrical shapes
00:51:08to show you their brilliance.
00:51:10At first, these precious stones
00:51:12are not so beautiful.
00:51:14They go through several stages
00:51:16of size and then become
00:51:18elegant pieces.
00:51:20This is how diamonds
00:51:22shine the most.
00:51:24Why are there two holes
00:51:26in an electric socket?
00:51:28The left hole is negatively charged.
00:51:30The right hole is positively charged.
00:51:32And the space below is the ground.
00:51:34Electricity must flow through the circuit.
00:51:36The current goes through the positive hole,
00:51:38through the charger of your phone,
00:51:40for example,
00:51:42then through the negative hole.
00:51:44Have you ever wondered
00:51:46what your jeans pocket was for?
00:51:48The small pocket was intended
00:51:50for this purpose.
00:51:52Today, no one wears
00:51:54this kind of watch anymore,
00:51:56but the pocket is still there.
00:51:58And you can slip small objects
00:52:00like a ring in it.
00:52:02In London, there are poles
00:52:04that look a bit like light bulbs,
00:52:06but they don't have bulbs.
00:52:08Their official name is
00:52:10Smelly Pipe,
00:52:12and they belong to history today.
00:52:14But they were very useful
00:52:16because they had
00:52:18undesirable consequences.
00:52:20Most kitchen scissors
00:52:22have metallic teeth
00:52:24that look like clamps
00:52:26in the middle between the handles.
00:52:28They can help you break nuts,
00:52:30crab shells,
00:52:32and other hard products.
00:52:34You can also use them
00:52:36to open jars and bottles
00:52:38or remove the stems of herbs.
00:52:40Leather often looks dull to the eye
00:52:42because it is covered
00:52:44with metal.
00:52:46But you don't want to leave
00:52:48your jacket in your cart
00:52:50next to an onion and potato net,
00:52:52do you?
00:52:54Hang it to the ring.
00:52:56It is made to help you
00:52:58organize your cart.
00:53:00They also have another storage area
00:53:02at the bottom.
00:53:04When your cart is full,
00:53:06you just have to lift this part
00:53:08and put a small basket
00:53:10for additional purchases.
00:53:12It can be difficult to remove
00:53:14with loose dental floss.
00:53:16You need more tension,
00:53:18so tie a knot.
00:53:20The stripes on the toothpaste
00:53:22can look a little strange.
00:53:24It's just a marketing trick.
00:53:26In the 70s,
00:53:28the leading toothpaste brand
00:53:30added blue stripes
00:53:32to indicate that its toothpaste
00:53:34had a double action.
00:53:36White toothpaste pads
00:53:38work just as well.
00:53:40They gradually lose their color
00:53:42over time.
00:53:44When the blue has disappeared,
00:53:46it's time to change your toothbrush.
00:53:48Have you ever noticed
00:53:50this little hole
00:53:52under the pads?
00:53:54It is there to drain the water
00:53:56and thus prevent the pads
00:53:58from rusting.
00:54:00It is also a place
00:54:02where you can lubricate it.
00:54:04A drop of oil will open
00:54:06and close much more easily.
00:54:08But thanks to these patterns,
00:54:10you can easily see
00:54:12if someone has cut the edges.
00:54:14If you have trouble peeling an orange,
00:54:16here is another method.
00:54:18First, cut the top and bottom.
00:54:20Make a notch on the side
00:54:22and pull to open it.
00:54:24This little metal operculum
00:54:26that you see at the orifice
00:54:28of your favorite cream
00:54:30is there for a reason.
00:54:32These tubes are usually sealed
00:54:34with aluminum foil.
00:54:36And push it.
00:54:38The little rubber disc
00:54:40under each metal bottle cap
00:54:42is not used to reveal
00:54:44if you have won soda for life.
00:54:46This is what keeps your drink
00:54:48tasty and fizzy.
00:54:50The cap retains the liquid
00:54:52inside and the rubber disc
00:54:54retains the gas inside
00:54:56until you drink it.
00:54:58If you use the blue part
00:55:00of your eraser to erase
00:55:02the pencil,
00:55:04the eraser will erase
00:55:06on much thicker paper.
00:55:08It works with pencil
00:55:10and even ink,
00:55:12provided that the paper
00:55:14is thick enough.
00:55:16Hair clips will never stay in place
00:55:18if the waves are not on the right side.
00:55:20They should always be
00:55:22facing your head.
00:55:24You still can't do it?
00:55:26Put a little lacquer
00:55:28on your clip
00:55:30before putting it
00:55:32in the indentation
00:55:34and pour it.
00:55:36On wine bottles,
00:55:38this is called spitting.
00:55:40These little sweets
00:55:42only ask to be opened
00:55:44differently.
00:55:46Look how happy they are!
00:55:48Try to tear the wrapping
00:55:50in the middle by opening it.
00:55:52No more sugar on your fingers,
00:55:54no more little paper hanging
00:55:56and your coffee is happier too.
00:55:58The wrapping of the cotton discs
00:56:00should be opened
00:56:02every time you take a disc.
00:56:04Look at the bottom,
00:56:06there is a pre-cut line.
00:56:08Tear it to open it and voila!
00:56:10Door handles are usually
00:56:12made of brass, bronze
00:56:14or copper alloy.
00:56:16Why? It's antibacterial
00:56:18so it prevents the microbes
00:56:20from spreading.
00:56:22In a few hours,
00:56:24the bad microbes are gone.
00:56:26But don't forget
00:56:28not the bottle
00:56:30if you want to enjoy
00:56:32a good fresh drink.
00:56:34The same goes for the glasses.
00:56:36The foot prevents your drink
00:56:38from overheating.
00:56:40Two zip ties is too much?
00:56:42Maybe, but it's very useful
00:56:44against theft.
00:56:46Just lock them together.
00:56:48No one can open your bag.
00:56:50You don't have a lock with you?
00:56:52You can also assemble them
00:56:54with a string or a trombone
00:56:56to keep your tie in place.
00:56:58You don't want it to slip away.
00:57:00Shoe manufacturers
00:57:02keep to their customers
00:57:04so most running shoes
00:57:06now have a pre-installed
00:57:08anti-bubble system.
00:57:10It may seem a bit exaggerated
00:57:12but it's actually the extra hole
00:57:14at the top of your shoes.
00:57:16Put your lace in the extra hole
00:57:18by inserting the lace upside down.
00:57:20Cross them and put them
00:57:22through the loops.
00:57:24Don't throw away
00:57:26a few packets of silica gel
00:57:28in your bags, shoes or others.
00:57:30They're there to absorb
00:57:32the excess moisture.
00:57:34So as soon as your shoes
00:57:36are a bit wet,
00:57:38put a few packets of gel
00:57:40in them and leave them
00:57:42overnight.
00:57:44You may have been using
00:57:46your shampoo badly
00:57:48all this time.
00:57:50Here's a tip.
00:57:52Don't use powder
00:57:54to make emojis.
00:57:56They're meant to protect
00:57:58the work of people.
00:58:00We used to live
00:58:02among starving rats.
00:58:04They were eating the paper.
00:58:06We set the limit
00:58:08to let people remember
00:58:10when to start their work
00:58:12so they're not lost
00:58:14and eaten by rats.
00:58:16American solo cups
00:58:18are key for any party.
00:58:20The bottom line indicates 30 ml, the second equivalent to 148 ml and the third to 355 ml
00:58:28If you like to put milk in your tea, try this trick next time
00:58:33Pour it by putting the orifice up
00:58:35It will splash a lot less and it's easier to control
00:58:39The headrests are quite comfortable and the detachable ones are there for your safety
00:58:43If you remove the headrest, you will see two solid metal bars
00:58:47If you are stuck or locked in a car, you can always remove the bars to break the glass and escape
00:58:53You saw it for the first time on the market in Iceland
00:58:58The volcanic bread
00:59:00You taste a slice and strangely, it's not bad
00:59:04You don't really know how it works and you want to know more about its manufacturing
00:59:08Hum...
00:59:09Is it me or this kitchen is very strange?
00:59:14The oven is located in the middle of the hot springs
00:59:18Be careful where you put your feet, it would be a shame to burn yourself with the steam escaping from the ground
00:59:23A local baker gives you the recipe for his rye bread
00:59:28Rye flour, ok
00:59:30Yeast, ok
00:59:32You mix everything and put it in a metal pot
00:59:35Then you have to dig the hole in which you will put the pot for cooking
00:59:39You dig a hole of about 40 cm and you reach the underground water that boils
00:59:44If you want to do like the natives, you can use your finger to take the temperature
00:59:49Ouch! It's hot!
00:59:51It's because the ground is heated by lava
00:59:54Iceland is one of the most volcanic regions in the world with its 30 active volcanoes
01:00:01You then have to bury your bread in this volcanic soil and let it cook for 24 hours
01:00:08The next day, the bread is ready and it is delicious!
01:00:12Ah! And the best is that you have just perpetuated an old Icelandic tradition
01:00:18People have been doing this since the 19th century
01:00:23Imagine now that it is your first day of work in a museum and that you have to clean the mask of Tutankhamun
01:00:29You grab your cleaning utensils and then...
01:00:31Oh no! It's not possible!
01:00:34You just broke Tutankhamun's beard!
01:00:36I don't wish it on anyone!
01:00:38But this is a true story
01:00:41In 2014, an employee of the Egyptian Museum broke Tutankhamun's beard
01:00:46and simply glued it back, hoping that no one would notice
01:00:50This mask was discovered in 1922
01:00:53and it is considered as one of the greatest symbols of our past civilizations
01:00:57Oh! And the best thing in this story
01:01:00Historians only noticed the graffiti in 2016
01:01:05If you visited the museum between 2014 and 2016, you probably saw a mask glued back
01:01:13If I tell you Sahara, what do you think of?
01:01:16A desert of sand worth seeing, isn't it?
01:01:19Well, according to researchers, the Sahara is not always a desert
01:01:23From time to time, it turns green again
01:01:26But you probably won't be able to witness this event
01:01:30Every 10,000 years, the Sahara goes through a wet period
01:01:33during which the sand gives way to lush vegetation and bluish lakes
01:01:39This phenomenon occurs due to the inclination of the earth's axis
01:01:42which affects several climatic zones
01:01:45Can you imagine the Sphinx surrounded by tropical forests?
01:01:48It would be incredible!
01:01:50Speaking of Sahara, imagine being able to return to 1800 BC
01:01:56You should arrive in time to witness the construction of the Black Pyramid of the city of Dahshur
01:02:02It is not at the same level as the pyramids of Giza
01:02:05but it has the same role, it is a necropolis
01:02:09In 1892, archaeologists discovered an important part of the Black Pyramid
01:02:14which had been lost for centuries
01:02:17The Benben, also called Pyramidion, the tip of the Egyptian pyramids
01:02:23A Benben is a solid block of limestone
01:02:27Most of these Benben were covered in gold
01:02:29and reflected the first rays of sunlight of the day
01:02:32Hmm, can I have a time machine, please?
01:02:37Do you remember the time when you ate this really spicy thing
01:02:39and your cheeks turned red?
01:02:41Apparently, it also happens to birds
01:02:44For example, canaries change color after eating peppers
01:02:48These birds have a special pigment that allows them to change color according to their diet
01:02:53If a canary eats red peppers, it turns red or orange
01:02:59Can a rock move on its own?
01:03:01Well, it's the impression given by the landscape of Raystrike Playa in California
01:03:07This is the bed of a dried up river
01:03:09where one of the strangest phenomena in the world, moving stones, is verified
01:03:14Imagine 40 kg stones wandering around
01:03:16dragging on the sand for more than 450 meters
01:03:20They were discovered at the beginning of the 20th century
01:03:23but no one had been able to see their movement until a recent time
01:03:27In 2014, after a lot of research, researchers solved the mystery
01:03:35Moving stones appeared thanks to the perfect balance between wind, ice and water
01:03:40When it rains, the water falls to the ground, freezes and forms a layer of ice
01:03:47The wind moves the stones that slide on the bed of the river
01:03:51But if you ever visit Raystrike Playa, don't bother the stones
01:03:58The island of Ray is located on the west coast of France
01:04:03It attracts tourists looking for picturesque landscapes and beautiful beaches
01:04:07But there is more
01:04:09An extraordinary phenomenon occurs when two currents of waves collide
01:04:14This is what we call a cross sea
01:04:17It's a bit like the sea turning into a chessboard, divided into several hundred squares
01:04:22And no, it's not an optical illusion
01:04:24The cross sea occurs when different currents of water meet
01:04:30If a tourist sees this phenomenon of cross sea on the island of Ray
01:04:33it's probably because there was a storm in a nearby sea
01:04:37These agitated waters move in the currents and come in contact with those that border the island
01:04:41producing these square patterns
01:04:45This phenomenon only occurs in Israel and on the island of Ray
01:04:48Nowhere else
01:04:51Our next site can either give you goosebumps or amaze you
01:04:57Let's say it depends on the time you visit it
01:05:00Not far from the small town of Gryfino in Poland
01:05:04there is a pine forest whose trunk has a twisted base
01:05:10If you go there during the day, you will probably be fascinated by these twisted trunks at an improbable angle
01:05:16You can even use them as a stool if you decide to have a picnic
01:05:20But at night, this forest has something distressing
01:05:25With this little fog and its strange shapes
01:05:27Not very welcoming
01:05:30Science still does not know why the trunks have this shape
01:05:34So, do you plan to visit during the day or at night?
01:05:39You go hiking and you find yourself caught in a thick fog
01:05:43It's a shame for the photos, but everything is not lost
01:05:48You may have the chance to see a white rainbow
01:05:53You must already know that these little pockets on the jeans were used to store the watches
01:05:58But what about the little metal buttons?
01:06:00They actually help to hold the fabric together
01:06:03Manufacturers place these buttons where the jeans can tear during movement or tension
01:06:08These little holes on some backpacks were designed to attach additional equipment
01:06:13So you can put laces there and attach sneakers if you don't want to put them in your backpack or have to carry them by hand
01:06:20This little dot next to the camera on your iPhone is a microphone
01:06:24It allows you to get a good quality sound when you take a video
01:06:28The Spotlight function of your Mac can be used not only for quick file and application search
01:06:34But also as a calculator
01:06:36You just have to type a mathematical operation that you have to solve
01:06:40Spotlight also uses the data of the internal dictionary
01:06:43Grab any word in the search bar and you will get information about it
01:06:48You just bought a new bottle of oil?
01:06:50You remove the lid and you see a small operculum that you can tear by pulling on a loop
01:06:55Remove it, but don't throw it in the trash
01:06:58Replace it upside down to control the flow by pressing your finger on it
01:07:03The tiny creases on the F and J keys of the keyboard help your fingers to navigate on this one during typing
01:07:10When your indexes are on these creases, you know exactly where the other letters are
01:07:16The brushes on the sides of the escalators are not used to tighten your shoes, but to ensure your safety
01:07:22These nylon hairs prevent your laces and clothes from penetrating the escalator wheels
01:07:27Which would not be a good news
01:07:29Most of the handles of American doors are made of brass
01:07:32This type of metal is effective against microbes
01:07:34Because bacteria cannot multiply as much on such surfaces
01:07:38It is not for nothing that public toilet cabins do not offer total privacy
01:07:43The space under the door is designed to make you want to get out of there as soon as possible
01:07:48Thanks to this design, there is much less waiting
01:07:51You can use a plastic soda can lid as a glass bottom
01:07:55It has the perfect shape to hold your drink and prevent the surface of a table from being wet
01:08:00Don't turn the lid upside down, just put it on the table the same way it was on the can
01:08:05If you are stuck in a car during an accident and you can't open the doors
01:08:10You can use the bars of the removable can to break the glass and get out
01:08:14Do you see these little plastic discs under the bottle caps?
01:08:17This little thing helps to preserve the vacuum inside the bottles
01:08:21Which keeps the soda in a sparkling state
01:08:24You have probably already looked at food heated in a microwave at least once in your life
01:08:29Yes, it's thrilling
01:08:30But why did the designers make doors so dark?
01:08:33This black grid is actually necessary to block electromagnetic fields
01:08:38The tiny dots on the padlocks next to the lock hole are designed to evacuate moisture if water enters inside
01:08:45In addition, if the lock blocks or starts to rust
01:08:48You can pour oil through this hole to solve the problem
01:08:52Golf balls are covered with tiny craters for better aerodynamics
01:08:56They are called faucets
01:08:58And this design helps the ball fly further and more stably
01:09:02Some cups have a small groove below the bottom
01:09:06It helps the water to flow and prevents it from accumulating when the cup is in the dishwasher
01:09:11At first, sunglasses were not invented to look in its direction
01:09:15These glasses were used during expeditions in the Arctic
01:09:18A huge amount of snow can make you blind, just like a prolonged flashlight
01:09:23To protect the eyes, we invented these unique glasses
01:09:26You can use any t-shirt, not only to dress up
01:09:30But also as a protective layer for your luggage
01:09:32Just put your clothes around your suitcase and don't waste time or money packing it in plastic
01:09:38The button at the back of your shirt keeps your tie under the collar
01:09:43But people no longer use it in this way because ties are now thinner
01:09:48This button remains decorative
01:09:51And here is the first function of the tie
01:09:54It was created in Europe in the 17th century to tighten the collar
01:09:58This way, people protected their neck from the strong wind
01:10:01Then, they got used to this part of the suit
01:10:04And made it an essential accessory of the bourgeoisie
01:10:07The soft pompoms on the caps were invented several centuries ago
01:10:12The sailors used them to avoid hitting their heads against the low ceilings and the bow of the ships
01:10:17Many belts are made of cedar wood
01:10:20Because it contains many natural oils that repel mites that like to eat your clothes
01:10:25The spherical shape of the bulbs allows the light to spread evenly
01:10:31In addition, such bulbs are cheaper and easier to make
01:10:35Have you ever found these pieces of fabric in new clothes?
01:10:38They are not only spare parts, but also samples of tests to be used before washing
01:10:43You can put this piece in the washing machine and see what happens to it
01:10:47If everything goes well, then you can wash the clothes without risk
01:10:51Your ceiling fan has two modes of operation, summer and winter
01:10:55You have to find the switch on it
01:10:58Push it up to activate the winter mode and down for the summer mode
01:11:02In summer mode, the fan pushes the air down
01:11:05In winter, it pulls the air up
01:11:08Most people have a round suction cup in their bathroom
01:11:11In the movies, they use it to flush the toilets
01:11:15In reality, it is used to flush the sink
01:11:18For the toilets, you have to use another special tool
01:11:22The drawer under your oven is not used to store pans and pans
01:11:26You can put dishes in it that will be kept warm by the heat of the oven
01:11:30It is useful if you are waiting for friends late for dinner
01:11:34You take out a packet of popcorn from the microwave after heating it
01:11:38You see this little hole at the top of the bag?
01:11:40You can use it to get rid of small unburst grains
01:11:43Shake the packet over a plate and all the grains will fall through the hole