Faits sur le corps humain à partager lors des discussions près de la fontaine d'eau

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Transcript

00:00:00 Each time we bathe, we use the muscles of our mouth and tongue,

00:00:05 and this contact can compress some glands that produce saliva.

00:00:09 As a result, we can project a tiny gush of saliva without even realizing it,

00:00:14 but it can reach 30 cm or more.

00:00:17 I had a friend at the university who could do that at will.

00:00:21 It was impressive!

00:00:23 It turns out that saliva is actually filtered blood.

00:00:26 Blood is treated with dedicated glands and special cells absorb these properties.

00:00:31 After that, the blood becomes saliva.

00:00:34 Another subject.

00:00:35 If your brain was a USB drive, it would be a real crazy thing.

00:00:39 The capacity of our brain is somewhere between 10 and 100 Teraoctets.

00:00:45 Some scientists say that the full spectrum can reach 2.5 Petaoctets.

00:00:50 It looks like a snack for dogs, doesn't it?

00:00:53 When the size of the English version of Wikipedia was calculated in 2010,

00:00:58 it only represented 5.6 Teraoctets.

00:01:01 Do you realize?

00:01:02 The heat of our body can boil almost 2 liters of water in 30 minutes,

00:01:07 even without doing anything.

00:01:08 We should try.

00:01:09 Our brain can perform up to 10 billion operations per second

00:01:14 with only 10 watts of energy.

00:01:16 A computer capable of doing so would need about 1 gigawatt of energy.

00:01:21 This quantity can feed up to 300,000 houses.

00:01:24 Our memory is affected by the position of our body.

00:01:27 For example, you are much more likely to remember a situation

00:01:31 where you saluted someone if you were standing and you did a hand sign.

00:01:35 Your brain has millions of neurons.

00:01:38 They are all different and the connection speed between each one is also different.

00:01:43 That's why you can remember some information faster than others.

00:01:47 Nervous impulses, however, are very slow compared to the speed of electricity.

00:01:52 Neurons can reach a speed of 432 km/h,

00:01:56 which is slower than the fastest car in the world.

00:01:59 It's still pretty fast because your brain has to react to urgent things

00:02:03 like pain or tickling.

00:02:05 Besides, the brain itself does not feel pain.

00:02:09 It does not have its own nervous endings.

00:02:12 People with red hair represent 1% of the population.

00:02:17 2% are natural blondes.

00:02:19 Yes, most people you see with these hair colors have brown hair.

00:02:24 Black is the most common hair color in the world.

00:02:27 Hair is not only strong, but also elastic.

00:02:30 They can stretch about 30% of their length when they are wet.

00:02:35 The average hair growth rate is 15 cm per year.

00:02:39 That is, if you never cut your hair until you are, say, 80 years old,

00:02:43 your hair will have grown 1,200 cm,

00:02:46 the height of a four-story building.

00:02:49 However, this is not really possible because the length of our hair

00:02:53 is genetically programmed.

00:02:55 The human eye is like a car engine.

00:02:58 Both need liquid to be well lubricated.

00:03:01 The engine needs oil and the eye needs tears.

00:03:04 To make sure the eyes work well, tears are distributed all over the eye.

00:03:09 That's why we blink more than 10,000 times a day.

00:03:12 The ocular muscle is the fastest muscle in our body.

00:03:15 We can blink five times a second or even more.

00:03:19 We spend about six seconds blinking every minute.

00:03:23 During the day, we spend 30 minutes in total darkness

00:03:27 simply because we close our eyes without counting the time we sleep.

00:03:31 The only part of the human body that does not receive any blood nutrients

00:03:35 is the eye's cornea.

00:03:37 The only thing it needs to function well

00:03:40 is the tears and the liquid in front of the eyes.

00:03:43 Most scientists agree that the tears that appear

00:03:46 as a result of emotion are a unique human characteristic.

00:03:50 No other animal is able to cry with sadness or joy.

00:03:54 The pupils shrink and expand to control the light that enters.

00:03:59 If there is a lot of light, they narrow the passage so that it does not harm the vision.

00:04:04 In the dark, the pupils expand to capture as much light as possible.

00:04:09 Now let's get back to our mouths.

00:04:12 The tongue has a lot of muscles,

00:04:14 and some of them can only be used when you learn a new language.

00:04:18 A human bite is almost always infected

00:04:21 because of all the bacteria that live in our mouth.

00:04:24 In this sense, we are quite close to hyenas.

00:04:27 Your bones are designed to be used on a daily basis,

00:04:30 and some of them can absorb your body weight two or even three times.

00:04:35 It's impressive, but your teeth are even stronger.

00:04:38 When you bite something, your teeth can exert an incredible pressure,

00:04:42 up to 90 kilos.

00:04:44 In this regard, the enamel is considered to be part of your skeletal system.

00:04:49 Our body is made up of about 60% water,

00:04:52 and we can even find some in the bones.

00:04:54 About 25% of the bone mass of humans is made up of water.

00:04:58 The chlorhydric acid present in our stomach,

00:05:01 the most important defender of our immune system,

00:05:04 helps us get rid of dangerous food toxins,

00:05:07 viruses and bacteria that accompany the food we eat.

00:05:11 The stomach itself can be digested by this acid,

00:05:14 but the mucous membrane protects it.

00:05:16 Even if you brush your teeth twice a day and never forget to bathe your mouth,

00:05:21 your mouth remains one of the dirtiest parts of the human body.

00:05:24 Buuurk!

00:05:25 Millions of bacteria live inside.

00:05:28 The good news is that most of these bacteria are good for the body

00:05:32 and protect it from bad bacteria and viruses.

00:05:35 Humans and giraffes have a similar neck.

00:05:38 A person has the same number of cervical vertebrae as a giraffe.

00:05:42 The difference, however, lies in length.

00:05:45 The giraffe's vertebrae are 25 cm long.

00:05:49 Our spine can withstand a pressure of up to 450 kg.

00:05:54 It would resist an adult zebra.

00:05:57 But please don't try to do it at home.

00:06:00 And there are no zebras anyway.

00:06:02 When you lie on your back and lift your knees,

00:06:05 the pressure exerted on the spine is about 11 kg.

00:06:10 It's not a zebra, but rather a good-sized cat.

00:06:14 Our spine is also very flexible.

00:06:17 If we could bend it, it could form two-thirds of a full circle.

00:06:21 We're like snakes, then.

00:06:23 In the morning, you're bigger than in the evening.

00:06:26 During your sleep, you're no longer affected by gravity

00:06:29 and your spine stretches,

00:06:31 which makes you gain up to 1.26 cm in height.

00:06:34 Too bad you're getting smaller every day.

00:06:37 The mountaineurs move your organs.

00:06:40 So when you feel like your stomach is falling,

00:06:43 it's because it's turning around in your body.

00:06:47 You think your fingerprints are the only thing unique to your body.

00:06:51 Well, that's not the case.

00:06:53 Your tongue and your smell are also unique.

00:06:56 If someone sniffs you, it's enough to warn you.

00:07:00 If all your blood vessels were drawn on one line,

00:07:03 it would hurt, but you'd go around the Earth more than twice.

00:07:07 An impressive feat you won't see

00:07:10 because you can't live without your blood vessels.

00:07:14 You think you're resting while you sleep,

00:07:17 but your brain never stops.

00:07:19 It's more active at night than during the day

00:07:22 and processes all the information you've collected.

00:07:25 So show some respect for it.

00:07:27 The liver is the most active organ in the human body.

00:07:30 It has more than 500 functions

00:07:32 and none of them are clear to scientists.

00:07:35 You've probably wondered why you feel so sleepy after lunch.

00:07:39 Well, it's because your circadian rhythm,

00:07:41 which runs at a 24-hour cycle,

00:07:43 asks you to take a nap after 7 a.m.

00:07:46 And food only strengthens that effect.

00:07:49 It's simple.

00:07:50 Teeth and headache are linked by the trigeminal nerves.

00:07:54 They go through the jaw to the head,

00:07:56 so that when you feel a toothache,

00:07:58 it usually goes in pairs with the one in the head.

00:08:01 You lose calories no matter what you do, even nothing.

00:08:05 A good 8-hour nap, for example,

00:08:07 can help you lose up to 800 calories.

00:08:10 And yes, you spend energy even while eating.

00:08:13 Like all mammals,

00:08:15 we have a reflex that slows down or even stops

00:08:18 certain bodily functions to prevent us from drowning.

00:08:21 It also affects the heart rate.

00:08:23 A person can stay without food for more than 20 days.

00:08:27 However, if you don't sleep for 10 days,

00:08:30 your body will simply stop working.

00:08:33 Speaking of sleep,

00:08:35 an average person forgets 90% of their dreams.

00:08:38 And that may be a good thing.

00:08:40 Otherwise, imagine how crazy the world would be.

00:08:43 The color of your dreams is influenced by the television

00:08:46 you watched as a child.

00:08:48 If you are part of the older generation

00:08:50 who watched television in black and white,

00:08:52 your dreams will most often be monochrome.

00:08:55 If you are used to colored television,

00:08:57 your dreams will also be multicolored.

00:08:59 Of the 10,000 people on Earth,

00:09:01 one has these mirror-like organs,

00:09:03 which means they are inverted

00:09:05 compared to their usual and normal position.

00:09:07 In other words, the liver would be bigger on the left side

00:09:10 and the right kidney would be a little higher than the left.

00:09:13 Speaking of kidneys,

00:09:15 the left is a little higher than the right.

00:09:17 That's because the liver is bigger on the right side of your body.

00:09:20 People with clear eyes, blue or green,

00:09:23 tolerate pain better than those with dark eyes.

00:09:26 Scientists think this could be due to melanin,

00:09:29 which affects the color of the eyes.

00:09:31 The length of your foot is similar to that of your forearm.

00:09:34 If you don't believe me, do the test.

00:09:36 I'll wait for you here.

00:09:38 No.

00:09:40 When a woman is pregnant,

00:09:42 her brain undergoes many changes

00:09:44 that prepare her for childbirth.

00:09:46 And part of her brain responsible for social signals decreases.

00:09:50 This makes the brain more efficient to take care of the baby.

00:09:54 But don't worry, it doesn't stay that way.

00:09:57 It returns to its standard size after pregnancy.

00:10:01 In one day, your body produces one liter of saliva.

00:10:05 That's about 303 liters per year.

00:10:09 And in one life, you can fill two Olympic pools with saliva.

00:10:13 Imagine swimming in it.

00:10:15 Burke.

00:10:16 It's both disturbing and disgusting.

00:10:19 Humans have a secret superpower hidden in our stomachs.

00:10:23 Our gastric acid.

00:10:25 It has a pH of about 1,

00:10:27 and it's one of the most acidic substances in the world.

00:10:30 It's so powerful that it can dissolve metals.

00:10:33 And the stomach must develop a special protective mucus

00:10:36 to prevent your whole body from dissolving.

00:10:39 But don't try to eat metals.

00:10:41 They can be toxic.

00:10:43 If you take a deep breath,

00:10:46 your left lung will be filled with much less air than your right lung,

00:10:49 because it is smaller.

00:10:51 And it takes up a lot of space.

00:10:53 So the left lung must make room for it.

00:10:55 The lungs are divided into lobes.

00:10:57 The right has three, and the left lung has only two lobes.

00:11:00 Your lungs are not the only organs that are not proportional in size.

00:11:04 Your kidneys are also a little different.

00:11:07 The left kidney is generally a little bigger than the right kidney.

00:11:10 If you've ever wondered what their size is,

00:11:13 your kidneys are the size of a fist.

00:11:15 Everyone knows that sharks have strong teeth,

00:11:18 but the outer layer of our teeth, called the enamel,

00:11:21 is as solid as the one that covers the shark's teeth.

00:11:24 Enamel is also the strongest substance in the body.

00:11:27 It protects our teeth from all kinds of damage

00:11:30 so that you can eat your favorite food in peace.

00:11:34 Toenails grow twice as slowly as fingernails.

00:11:40 And if there was an Olympic sport that determined which nail grew the fastest,

00:11:45 your little finger nail would always come last,

00:11:48 because it's the nail that grows the slowest of all.

00:11:51 The reason is that some fingers are not used as much as others,

00:11:55 and do not have as much blood supply.

00:11:57 There are strange animals, such as shrimp and crabs,

00:12:01 that lose their skeletons to grow.

00:12:04 Don't be shocked to learn that we do the same thing.

00:12:07 We don't literally drop our skeleton, of course,

00:12:10 but we regenerate slowly again every ten years.

00:12:13 So, over our lifetime, we will change our skeleton about eight times.

00:12:18 Many years ago, we were like reptiles, like the evil Spider-Man lizard.

00:12:23 Fortunately, we have evolved and lost almost all our reptilian characteristics,

00:12:27 except for the third vestigial eyelid,

00:12:30 which is partially visible at the end of your eye near your nose.

00:12:34 Reptiles still have it, it is used to protect and clean the eye.

00:12:38 If you have a polychore, your eye can develop more than a pupil.

00:12:42 Unfortunately, this will not improve your vision.

00:12:45 In fact, it can worsen it, but in most cases, it will not affect your vision much.

00:12:50 This condition is extremely rare and usually starts in childhood,

00:12:54 but it can also develop later in life.

00:12:57 Dermatography is a generally harmless condition

00:13:00 that allows you to write almost literally on your skin.

00:13:03 People with this condition do not need a notebook to take notes.

00:13:07 If you have this condition and you scratch your skin lightly,

00:13:10 the redness can last half an hour.

00:13:13 This could be useful for your next exam, if you see what I mean.

00:13:17 Another unique condition that some people have is syndactyly, or palpated toes.

00:13:23 It's when your toes are fused together.

00:13:25 Nobody knows what causes it, but it's not serious.

00:13:29 Did you know that your tongue is as unique as your fingerprints?

00:13:34 Me neither.

00:13:35 The tongue has special shapes and geometric figures,

00:13:38 like fingerprints, which differ from one person to another.

00:13:42 Who knows, maybe we'll unlock our phones by licking them in the future.

00:13:47 An adult is made up of about 7 octillions of atoms.

00:13:50 It seems unreal, but it's true.

00:13:53 This number is so large that I can't even say it in one breath.

00:13:57 It's 7, followed by 27 zeros.

00:14:00 The ear wax looks like wax, has the texture of wax and tastes like...

00:14:06 Of course, I have no idea what it tastes like, and I beg you not to try to discover it.

00:14:11 My point is that it's not really wax.

00:14:13 It's a combination of fat, skin cells, dirt and sweat.

00:14:17 It's important for the health of the ears, because it keeps them clean.

00:14:21 Book by book, bones are much more solid than steel.

00:14:27 The same bone density will almost always outweigh steel.

00:14:31 But if you compare the same bone and steel volume, the bone will break before the steel.

00:14:37 Bones are made to be light and solid.

00:14:40 If they were made of steel, we would be much heavier and would need much more energy to move.

00:14:45 When you were born, you had more water than now because most of them merged.

00:14:50 An adult person has 206 bones, while babies have 300 bones.

00:14:55 Some of these bones are made up of cartilage, which is flexible and soft.

00:15:00 The strongest, heaviest and longest bone is the femur.

00:15:05 This bone is the most difficult to break.

00:15:07 It can support up to 30 times the weight of your body, or about 2721 kg.

00:15:13 Technically, you could balance two small cars on your femur and remain unharmed.

00:15:18 Bioluminescence is a talent that some animals have, like the angelfish, the lucioles, the lantern fish and humans.

00:15:26 And yes, you really shine in the dark.

00:15:29 Scientists have discovered that we shine.

00:15:31 But the sparkle is a thousand times weaker than what our eyes can detect.

00:15:35 You can see your own light if you have an ultra-sensitive camera.

00:15:39 The amount of melanin you have in your eyes determines their color.

00:15:44 Brown eyes contain the largest amount of melanin, while blue eyes have much less.

00:15:50 However, people with heterochromia may have different eye colors.

00:15:54 One eye can be blue, and the other brown, or any other color, which is cool.

00:15:59 Sometimes, only half the eye can be of a different color.

00:16:03 When you blink, the air coming out of your nose and mouth can reach nearly 161 km/h.

00:16:09 We blink because an irritant penetrates the nose, and the body blinks to eliminate it.

00:16:14 And if you've heard that your eyes can leave their orbit if you blink without closing them, it's a lie.

00:16:20 Nothing will happen.

00:16:23 The heart is the only muscle that works 24/7.

00:16:28 It beats more than 3 billion times in a person's life, and pumps about 9500 liters of vital fluid every day.

00:16:35 So, you should take care of it, because it works very hard.

00:16:39 Your osteoarthritis is actually not a bone, but a nerve.

00:16:42 That's why when you hit it, you feel like a thousand ants are crawling under your skin.

00:16:48 This nerve is quite long. It starts in the spine and ends in your ear and your ring finger.

00:16:54 Almost all of us have heard that our noses and ears never stop growing.

00:16:59 Well, that's not really true.

00:17:01 Our noses and ears stop growing when we become teenagers, but they get bigger as we age, because gravity attracts them.

00:17:08 So, they really stretch.

00:17:10 They don't grow.

00:17:12 When you don't sleep enough, the brain can really start devouring itself.

00:17:16 13 protected neurons are destroyed when you don't get a good night's sleep.

00:17:20 It's a lot of brain power to lose.

00:17:23 Instead of finishing this episode of your favorite show, go to bed.

00:17:27 It's not worth it.

00:17:29 When you are well rested and you have slept enough, your brain can generate electricity to power a light bulb.

00:17:35 And your neurons can send more messages than all the phones in the world combined.

00:17:39 They move at a speed of about 241 km/h. And the signals transported by your motor neurons can move twice as fast.

00:17:48 Your brain will grow by about 2% if you venture into space.

00:17:53 Under normal gravity, we think that the liquid in the brain naturally moves down when we stand up.

00:18:00 And it has been proven that the absence of gravity prevents this.

00:18:03 Which explains why the liquid would accumulate in your brain and in your skull.

00:18:07 And no, that's not where the expression "big head" comes from.

00:18:11 A bouquet of flowers may have a sweet scent for you, but people with cacosmia perceive things differently.

00:18:18 For them, all the smells in the world are unpleasant.

00:18:21 Yes, they think it stinks. And by the way, among all our senses, the smell is the highest.

00:18:27 We still remember 65% of the smells after a year, but only 50% of what we have seen over the last three weeks.

00:18:35 We also have a new nose every 28 days, because these cells are renewed every four weeks.

00:18:41 We don't smell when we sleep. Well, unless, of course, we haven't washed for a while.

00:18:46 Your smell becomes suspicious when you sleep.

00:18:49 That's why it's almost impossible to notice a gas leak at night.

00:18:53 During our sleep, there are only noises that can save us, because our "yes" continues to work.

00:18:59 Almost half of your taste buds will have disappeared when you are 60.

00:19:04 You may finally start eating broccoli.

00:19:07 Your smell also loses its acuity with age.

00:19:10 As for taste, again, we are especially careful about our smell, because it helps us perceive up to 95% of flavors.

00:19:18 Without the smell, it would be difficult to distinguish an apple from a raisin.

00:19:22 When you cough, you exhale at about 100 km / h.

00:19:26 Be careful of the speed limit.

00:19:29 The "ok" is a two-step process.

00:19:32 First, you inhale a lot of air because of a muscle spasm, and then "blanc".

00:19:37 Your respiratory tracts close, the air is blocked, and the noise we all know is heard.

00:19:42 We need our ears not only to hear, but also for our balance.

00:19:47 Our vestibular system is located in the inner ear.

00:19:50 The channels contain liquid and tiny sensors that help you maintain balance.

00:19:56 In fact, the ears have bones, and they are the only ones that never grow.

00:20:01 It is thanks to them that we hear, because they transmit sound vibrations.

00:20:05 Doctors call it the ossicular chain.

00:20:08 It consists of the malleus, the incus and the stapes, also known as hammer, anvil and calf.

00:20:15 And they are an integral part of the middle ear.

00:20:18 Our ears continue to grow throughout our life.

00:20:21 They also sweat, and the cerebrum is actually the sweat they produce.

00:20:26 In fact, our nose never stops growing, maybe because of all these lies.

00:20:32 The heart is the only muscle that never gets tired.

00:20:35 The aorta is massive, its diameter is almost equivalent to that of a garden watering pipe.

00:20:41 All the bones of our body are linked to each other, except the aorta, which does not join the other bones.

00:20:47 This bone serves as a support for your tongue, and it is one of the most rarely broken.

00:20:52 If you have red eyes in a photo, it is the fault of the light that bounces.

00:20:56 The flash reflects on the capillaries of your retina, thus creating this effect.

00:21:01 Let's talk a little more about the eyes.

00:21:03 The most efficient camera has 200 megapixels.

00:21:06 A human eye has 576.

00:21:09 That's why sunsets are so much more beautiful in real life than in photos.

00:21:14 The eyes of a mountaineer really move your organs.

00:21:17 When you feel like your stomach is falling, it is because it is really being thrown inside your body.

00:21:23 The lips are much more sensitive than the fingers, because they have about a million nerve endings.

00:21:29 They are 100 times more sensitive than the tip of the fingers.

00:21:32 The grooves and the sills of our lips make their imprint unique, just like our fingers.

00:21:37 And they do not change throughout our life.

00:21:40 The imprint of our tongue is also unique elsewhere.

00:21:43 All the inhabitants of the earth have a smell that is specific to them, but the real twins have exactly the same.

00:21:49 It must be because they have identical genes.

00:21:52 Usually, we lose about 50 to 150 hairs a day.

00:21:56 The average life span of a hair is 5 years, and as soon as an old hair says goodbye to your scalp, a new one begins to grow immediately.

00:22:04 In your body, you carry enough bacteria to fill a can.

00:22:09 You have about 1.5 to 2 kg of bacteria in you, or 2% of your total weight.

00:22:15 But most of them are waste from our body.

00:22:18 A human being has between 20,000 and 25,000 genes.

00:22:21 Pretty impressive, isn't it?

00:22:23 Well, the Corn Flakes have more than us.

00:22:26 Fortunately, it is a matter of sophistication, not quantity.

00:22:30 Anyway, Corn Flakes 1, humans 0.

00:22:33 We are made up of many chemical elements, including iron.

00:22:37 The iron in our body is enough to produce 3 nails, each 2.5 cm long.

00:22:44 The carbon we have could be used to make 900 pencils.

00:22:48 We use our feathers to make pens.

00:22:50 Oh no, these are the birds. What a distraction I am making.

00:22:54 Our liver has the superpower to regenerate if it lacks a piece.

00:22:58 It can grow back and reach the size necessary for your body.

00:23:02 Fat helps our body to assimilate vitamins.

00:23:05 Vitamins A, D, K and E can only be properly absorbed if they are dissolved in fat.

00:23:12 Our body has enough fat to produce 7 soap bars.

00:23:16 But it's not like making soap at home.

00:23:18 When we are awake, our brain can produce enough energy to light an electric bulb.

00:23:23 It has a power of 10 watts.

00:23:25 Eureka!

00:23:27 Our navels contain an entire animal encyclopedia, with a range of about 70 different bacteria.

00:23:34 Some of them can also be found in the ground in Japan, and even in the shoulder ice cap.

00:23:39 Our bodies shine, but we can't see it with the naked eye,

00:23:43 because the light we emit is a thousand times less intense than the minimum level we can perceive.

00:23:48 And by the way, the carmin used in cheek lights and lipstick is a red glue made of ground beet.

00:23:55 Burk!

00:23:57 Our saliva helps us perceive the taste of food.

00:24:00 Our taste buds only start working when they are dissolved.

00:24:04 A silk has a lifespan of only 150 days.

00:24:07 The longest silk in the world is about 10 cm long.

00:24:11 They are also the refuge of tiny aquariums.

00:24:14 We blink about 4,200,000 times a year.

00:24:18 At least once every 8 seconds.

00:24:21 It would be cool if we were given a cent each time.

00:24:24 We would make more than 100 euros a day.

00:24:26 It may seem crazy, but our bones are stronger than a lot of building materials.

00:24:31 16 cubic centimeters of human bones can support about 8,600 kilos,

00:24:35 which is four times more resistant than concrete.

00:24:38 The only thing that makes our blood type different is sugar.

00:24:42 Groups A, B and AB contain sugars, while group O does not.

00:24:48 And these donors are universal.

00:24:50 The lack of sugar does not make the blood of group O less sweet.

00:24:53 In fact, it attracts even more mosquitoes than other blood groups.

00:24:57 People have only 8 blood groups, while cows have 800 and maybe even more.

00:25:03 Positive and negative, for example.

00:25:07 The nails of our fingers grow much faster than those of our toes.

00:25:11 The latter grow almost four times slower because they wear less than the nails of our hands.

00:25:15 Even if we often hit them, the blue ones that form there generally do not last long.

00:25:20 Nails not only help us to catch small things and to take off stickers.

00:25:25 If you did not have this rigid structure against which to press,

00:25:28 you would not be able to judge the firmness with which you have to hold objects.

00:25:33 Very few people can really digest milk.

00:25:36 The thing is that there is a special enzyme, let's call it a little assistant,

00:25:40 which breaks down the sugars that milk contains.

00:25:43 As we grow up, we lose this enzyme.

00:25:46 This sugar is called lactose, and adults who cannot digest it are said to be lactose intolerant.

00:25:53 In fact, 68% of the world population cannot digest milk.

00:25:58 When you sleep, your whole body does not rest as much.

00:26:01 In reality, your brain must sometimes work even harder.

00:26:05 It must process tons of information, and typing reports usually takes a lot of time.

00:26:10 Humans cannot do several things at once.

00:26:13 We need time to switch from one task to another,

00:26:16 and if we try to tackle several things at once, we will not be very productive.

00:26:21 Try this.

00:26:22 Raise your right foot and turn it clockwise.

00:26:26 Now try to write the number 6 with your big toe in the air.

00:26:30 Then check the direction in which your foot is moving.

00:26:33 It moves in the opposite direction, because to write the number 6,

00:26:37 you have to make a movement in the opposite direction of the needles of a watch.

00:26:41 A new habit takes a lot of time to set up.

00:26:44 It is not 100% true that 18 or 21 days are enough, as many people think.

00:26:50 Acquiring a new habit can take up to 254 days,

00:26:54 but on average it takes about 66 days for something to become automatic.

00:27:00 We can reasonably move forward than falling from any height can be very dangerous.

00:27:06 It is even more true when you fall from a plane, and much worse when it happens without a parachute.

00:27:12 The trick is to create air resistance to slow down the descent.

00:27:16 So use your shirt, your pants or the position of the angel,

00:27:20 anything to reduce the speed a little.

00:27:23 But whatever it is, prepare for the impact.

00:27:26 Some are more likely than others.

00:27:28 A Yugoslavian working as an air hostess survived an incredible fall on January 26, 1972.

00:27:35 After the plane she was working on exploded in mid-flight.

00:27:39 Falling from a height of 10,000 meters, she managed to survive,

00:27:43 but spent the next year and a half recovering after waking up from her coma.

00:27:48 Experts do not agree on the right way to cushion the fall,

00:27:51 but there is definitely a bad way to land on your head.

00:27:55 Do you remember the rule of three for the survival of humans?

00:27:59 3 minutes without oxygen, 3 days without water, 3 weeks without food.

00:28:03 It's a basic rule, but some people manage to pull a little on the rope.

00:28:08 If watching a sunset, smelling the scent of flowers, or ordering a big juicy burger is important to you,

00:28:14 well be grateful for this delicious gas that is oxygen.

00:28:18 Or try to do one of these things without it.

00:28:21 Two minutes without oxygen make an adult lose consciousness.

00:28:25 After 10 minutes, well, there is usually no return to life.

00:28:30 This varies of course from person to person, depending on the level of physical form,

00:28:35 but there are some who love to push the limits.

00:28:38 The longest time someone held their breath was 24 minutes and 3.45 seconds.

00:28:45 It's 100 times longer than the first flight by plane.

00:28:48 The White brothers have a lot to hold on to.

00:28:51 The Spanish Alex Segura Vendrell pushed the limits of apnea in 2016

00:28:56 by floating in a controlled swimming pool environment.

00:28:59 Just before going underwater, he sucked air like a fish to try to store as much oxygen as possible.

00:29:06 Strangely, holding your breath underwater is easier than on land.

00:29:11 Swimming activates the diver's reflex, which slows down our heart rate and metabolism.

00:29:17 Not only is oxygen important, but also the precious H2O and delicious foods.

00:29:23 Each cell in our body needs water to survive.

00:29:27 If we can't quickly replace water loss, we only have 3 days to a week before everything is over.

00:29:34 Air humidity, our age, our physical activity and our health

00:29:39 play a huge role in water retention in our body.

00:29:43 When we lack water, the important areas of our body, such as the heart and brain,

00:29:47 draw water wherever they can.

00:29:50 Like a sponge, these organs absorb everything until there is nothing left.

00:29:55 In 1979, a nutritionist in a detention cell held on for 18 days without water.

00:30:01 He would have licked the condensation on the prison walls to stay hydrated.

00:30:05 What is the scariest thing in the universe?

00:30:08 An empty refrigerator. Without any calories, your body starts to feed on itself.

00:30:14 Not exactly the diet you had planned for this year.

00:30:18 During the first few days, our glycine reserves are transformed into glucose.

00:30:22 When all this is exhausted, our body starts to target fat, muscles and other proteins, up to the bones.

00:30:29 Fasting is a common way to let our body consume the reserves we have.

00:30:34 The longest fast in Mahatma Gandhi's life lasted 21 days.

00:30:39 The longest known fast was that of a 27-year-old man who fed on water and vitamins for 382 days,

00:30:46 and who went from 205 to 81 kilos.

00:30:50 Our body is equipped to survive without food for long periods.

00:30:54 Our ancestors did not really have a supermarket or to do the shopping.

00:30:58 This made us rather well-armed creatures to face hunger.

00:31:02 As humans, we can face many extreme survival situations,

00:31:07 but how long can you swim in ice water without turning into an ice stick?

00:31:11 What happens if you are stuck in the desert or at the top of a mountain?

00:31:16 Climbing the world's summits, such as the Rocheuses, the Alps or even Mount Everest, is a challenging task,

00:31:22 but the real danger lies in the high altitude of the mountains.

00:31:26 It affects about half of climbers.

00:31:28 From about 1,500 meters above sea level, lack of oxygen can cause dizziness, fatigue and headaches.

00:31:35 Some may even have insomnia.

00:31:38 This is just the beginning of a whole series of symptoms that affect our body.

00:31:42 Losing consciousness can become a big problem for most people from 5,000 meters above sea level without proper preparation.

00:31:50 A too fast ascent can even cause fluid to be present in your lungs or, even worse,

00:31:56 the altitude sickness of the mountains does not worry whether you are young or old, man or woman, a slipper or an athlete.

00:32:03 Everest is 8,800 meters high and is the ultimate challenge for climbers.

00:32:08 It's like climbing the Empire State Building 20 times or the Hollywood Walk of Fame twice.

00:32:14 The Austrian Felix Baumgartner pushed the tolerance limit to the altitude on October 14, 2012.

00:32:21 He jumped from 128,000 feet of altitude, or nearly 40 kilometers.

00:32:26 It is not surprising that he is also the first paratrooper to exceed the speed of sound,

00:32:31 reaching the stunning figure of 1,340 km / h.

00:32:35 He obviously had the right equipment, including a pressurized suit with oxygen and safety systems.

00:32:42 If you go up in altitude, remember the 5P.

00:32:45 Proper planning prevents poor performance.

00:32:49 Surviving in extreme heat is not just a matter of temperature.

00:32:53 Humidity is the real danger to us.

00:32:56 The less humid the air, the more water remains where it should be, inside our body.

00:33:02 Have you ever entered a sauna at more than 110 degrees Celsius?

00:33:06 It's so hot and humid that you'll probably only last three or four minutes at most.

00:33:12 Wait, humans can't melt.

00:33:14 If, above 40 degrees Celsius, there is a real risk of heat stroke.

00:33:19 It doesn't seem to be a big change compared to our usual body temperature, but it is.

00:33:25 Imagine that you are lost in a desert for a few days, and not just any desert, the hottest in the world.

00:33:31 The hottest temperature ever recorded on Earth was in Nevada,

00:33:35 a crazy temperature of 56.7 degrees Celsius.

00:33:40 Cooling down very quickly can help you relieve cramps, headaches and even nausea.

00:33:45 But breathing can become almost impossible once your organs start to stop and hypothermia sets in.

00:33:52 As soon as our body goes below its natural body temperature, our muscles begin to stiffen.

00:33:58 This is why you no longer feel the cold and pain after a while, because your nervous system stops working.

00:34:05 Shivering to produce heat is the natural way our body keeps our organs warm, but it only works in the air.

00:34:13 In cold water, shivering drains your body heat even faster.

00:34:18 If you've never heard of the 300 Club, it's normal.

00:34:22 An Antarctic base has found an excellent way to test the extreme limits of the human body in the most unique way possible.

00:34:29 Participants warm up in a sauna heated to 93 degrees Celsius.

00:34:34 Then they put on their boots and run outside where it's -73 degrees Celsius.

00:34:40 Not only do they have to withstand the change in temperature of 166 degrees,

00:34:44 but they also have to run around the South Pole before returning to the sauna to warm up again.

00:34:50 It's time to do a little sum.

00:34:52 Sleep is very important for the body, and that's perhaps why getting out of bed in the morning is so difficult.

00:34:58 We need sleep to recharge our batteries after the long day we've just spent.

00:35:03 Our brain can malfunction in the event of insomnia, and 8 good hours of sleep are ideal for a healthy immune system.

00:35:11 Sleeping improves our memory, our heart, and puts us in a better mood for the day.

00:35:16 Randy Gardner and his friends have decided to test the limits of waking up in the context of an exposcience project.

00:35:23 They managed to stay awake for 11 days and 25 minutes.

00:35:27 When tested during and after the experiment, Randy managed to play basketball without abnormal brain waves.

00:35:35 It's almost impossible to calculate the exact G-force that could injure a human.

00:35:40 There are three types of G-force. From one side to the other, from top to bottom, and from front to back.

00:35:47 The danger lies in the time we spend sitting down while we're projected like a rag doll.

00:35:52 The longer we sit, the more it affects our body.

00:35:56 We're doing the G-force experiment at home, simply by sitting down too quickly on the couch,

00:36:02 lying down, or getting a slap in the back that's a little too strong.

00:36:06 Pilot John Stapp has shown that a human can withstand more than 40 G-force.

00:36:11 That's almost ten times more than an average racing driver.

00:36:15 The experiment only lasted a few seconds, but for a moment, his body weighed nearly 3,175 kilos.

00:36:22 To survive, you don't always have to face the elements. Sometimes, you have to fight against time itself.

00:36:28 The current human longevity record is held by Jeanne Calment, who was born in 1875.

00:36:35 [Music]

00:36:39 It may seem strange, but very few people can actually digest milk.

00:36:43 It turns out that there is a special enzyme that breaks down the sugars in milk.

00:36:48 Once you become an adult, you no longer have this enzyme, and only a little over 30% of people retain part of it.

00:36:55 Our brain can store only 7 bits in its short-term memory.

00:36:59 Don't even try to compare your brain to the capacity of a smartphone, not even the one you had in 2005.

00:37:04 A single bit contains 8 bits. That's why you sometimes have trouble learning a phone number by heart.

00:37:10 Our short-term memory works like a blackboard.

00:37:13 You can get information, but sooner or later, you lack space.

00:37:17 To check your memory, do this test.

00:37:20 Ask a friend to write a list of 10 words and read it to you.

00:37:23 Most people remember 7 elements of the list, or less.

00:37:27 Work memory is an essential thing that we need to do almost all daily activities,

00:37:32 including basic conversations, space-oriented, and even to try to copy the movements of a fitness video.

00:37:39 If you wear a headscarf, it will also warm your hands and even your feet.

00:37:44 With a hat or a hat, the heat is trapped inside and circulates throughout your body, including up to your toes.

00:37:51 Finally, good news.

00:37:53 Fingernails grow faster than toes, so you can officially cut your toes a little less often.

00:37:59 It's true that it's not very pleasant.

00:38:01 If you sleep, that doesn't mean your whole body is resting.

00:38:04 In fact, your brain sometimes has to work even harder when you sleep.

00:38:08 It has to process tons of information, and reports usually take a lot of time.

00:38:13 Humans can't do several things at once.

00:38:16 We need time to switch from one task to another.

00:38:19 If we try to tackle several things at once, it won't be very productive.

00:38:24 You are probably unable to isolate your ring finger from your other fingers.

00:38:28 Every time you move your little finger or your middle finger, you also move your ring finger.

00:38:32 The ability to isolate it is hereditary.

00:38:35 When you spread your arms, the distance between your two hands is almost equal to your height.

00:38:41 It's not true that people can't touch their nose with their tongue.

00:38:45 This superpower is called the "Gorlin's sign", and about 10% of the world's population has it.

00:38:51 Try this one.

00:38:53 Lift your right foot and start turning it clockwise.

00:38:57 Try to trace the number 6 with your big toe in the air.

00:39:01 Now, check the direction your foot is turning.

00:39:04 It's turning in the opposite direction, because to write the number 6,

00:39:08 you have to make a movement in the opposite direction of the hands of a watch.

00:39:12 People with a double-jointed thumb can bend it backwards.

00:39:16 It seems very unusual, and very few people can do it.

00:39:20 Yet, it's perfectly normal, and it doesn't hurt at all.

00:39:25 The next time you talk to a friend, try to breathe through your nose.

00:39:29 Don't pause to breathe, and try to do it in the middle of a sentence.

00:39:33 It can be quite difficult, only 1% of people are able to do it, and they are generally musicians.

00:39:40 Our brain is actually quite big, almost as big as a pigtail.

00:39:45 It can be compressed in a relatively small head, because it is very rigid.

00:39:50 If you could spread it out, you would see how smart you are.

00:39:54 We are made of tiny cells.

00:39:56 To visualize how small these cells are,

00:39:58 imagine that 10,000 of them could easily hold on to a pinhead.

00:40:03 You can literally shine at night.

00:40:05 Many fish, algae and mushrooms are bioluminescent.

00:40:09 And you too.

00:40:10 It turns out that human beings can emit light.

00:40:13 But your friends will never see it without special tools,

00:40:16 so you won't be able to really invent it.

00:40:19 It takes a little time to get used to it.

00:40:22 It's not 100% true that 18 or 21 days are enough, as many people say.

00:40:27 The process of acquiring a new habit can take up to 254 days.

00:40:32 But on average, it takes about 66 days for a new habit to become automatic.

00:40:38 If you want to be a little happier, try to spend a little money for others.

00:40:42 Humans are social creatures, and we needed the help of others to survive.

00:40:47 Our brain has developed a reward system.

00:40:50 When we do something positive for others,

00:40:52 we secrete leucitocin, one of the hormones of happiness.

00:40:57 When you sleep, you can't smell bad,

00:41:00 because your smell is deactivated during the night.

00:41:03 Even if there is a really bad smell in your room, you won't be disturbed.

00:41:08 For a long time, we thought that a person could smell more than 10,000 smells.

00:41:12 A recent study has shown that people were able to smell more than a billion smells.

00:41:18 We remember them better than anything else,

00:41:20 and smells can even evoke distant memories.

00:41:24 Tomatoes are more harmful than humans,

00:41:26 but you shouldn't worry, because it's not the number that counts,

00:41:29 but the complexity of their connection.

00:41:32 Nails don't just help us catch little objects and take off the labels.

00:41:37 If you don't have a rigid structure against which to press your fingers,

00:41:41 you won't be able to judge the strength with which you can hold anything.

00:41:45 Your toes are the humble assistants that support about 40% of your weight.

00:41:49 If you've heard that humans don't really need their toes, don't believe it.

00:41:54 They are also the main elements that grow when you walk.

00:41:59 We have two really fast muscles.

00:42:01 They control the closure of the eyelids.

00:42:03 In fact, they are the fastest muscles in our body.

00:42:07 The eyes are fragile and need protection.

00:42:09 That's why when the reflex is triggered,

00:42:12 these muscles close their eyes in about 100 milliseconds,

00:42:15 not more than 0.1 seconds.

00:42:18 If you find hair in the bathroom after taking a shower,

00:42:22 that doesn't mean you're getting bald.

00:42:24 It's normal, because we lose on average 40 to 150 hairs a day.

00:42:29 Baldness becomes visible after losing more than 50,000 hairs.

00:42:34 We only see blue-purple, green-yellow and yellow-red colors.

00:42:38 Everything else is a combination of these three colors.

00:42:41 It's impossible to calculate how many of these combinations the human eye perceives,

00:42:45 because each person has slight differences in vision.

00:42:48 But it's about a million combinations on average.

00:42:51 All the hair you see on your head

00:42:53 only represents about 10 to 15% of all the hair you have.

00:42:57 These hairs are in their resting phase,

00:42:59 and either they don't grow yet, or they fall.

00:43:02 80 to 90% of them grow at some point.

00:43:06 The retina is more reliable than the fingerprints.

00:43:11 The fingers have about 40 unique characteristics,

00:43:14 while the eye has 256.

00:43:16 We feel about 80% of the taste of any food

00:43:21 thanks to our nose and its ability to recognize smells.

00:43:24 If you pinch your nose while you eat,

00:43:26 you won't feel the taste of food.

00:43:29 You can have a bar of chocolate or smoked fish in your mouth.

00:43:32 There won't be any difference for you.

00:43:34 Your nose doesn't just help you breathe and sense smells.

00:43:38 It filters the air for the throats and sensitive lungs.

00:43:41 If we inhale dry air, the nose moisturizes, cools it down,

00:43:45 or heats it up if necessary.

00:43:47 In addition, the nose cleanses the air of dirt.

00:43:49 Where do you think the nose dents come from?

00:43:53 The human eye is similar to the engine of a car.

00:43:56 Both need different liquids to function properly.

00:43:59 An engine needs lubrication with oil,

00:44:02 and an eye needs tears.

00:44:04 To function properly, tears need to be distributed all over the eye.

00:44:07 That's why we blink our eyes up to 20,000 times a day.

00:44:10 In short, a pupil is like an ice cream scoop.

00:44:14 We can accidentally digest small things,

00:44:17 such as plastic objects, glass, coins,

00:44:20 and many other small objects.

00:44:22 They will make their way through the digestive tract in less than 48 hours.

00:44:25 See you later!

00:44:27 We can digest plastic in case of emergency, and in small quantities.

00:44:31 But the human digestive system can't really stand grass.

00:44:35 Ruminants have special teeth and several stomach sections

00:44:38 to treat leaves and raw grass,

00:44:40 while we don't have any of those equipment.

00:44:43 That's why cows exist.

00:44:46 Have you ever wondered why you feel so tired after lunch?

00:44:50 Well, it's because your circadian rhythms, which are 24-hour cycles,

00:44:54 force you to take a nap after 7 a.m.

00:44:57 and digestion only adds to that effect.

00:45:00 When you feel like eating a nanka,

00:45:02 your brain sends you a signal that you're lacking vitamins or minerals.

00:45:06 You probably don't need as much chocolate as you think.

00:45:10 So, choose nuts instead.

00:45:13 Did you know?

00:45:14 A single hair can withstand a traction of about 85 grams.

00:45:18 On average, a person has about 150,000 hairs.

00:45:21 And when your hairs are together, they can withstand a traction of about 13 tons,

00:45:25 which is the weight of two elephants, not to mention peanuts!

00:45:29 The electricity produced by your brain would be enough to light a small bulb,

00:45:33 if only you knew how to do it.

00:45:35 If you're not bad when you cut your nails or your hair,

00:45:38 it's because the only living part of them is under your skin.

00:45:41 Also, our nails grow faster in summer than in winter,

00:45:44 even in places where there's not much difference between seasons.

00:45:47 And your nails grow faster on your right hand,

00:45:50 probably because you use it more often.

00:45:52 It must stimulate their growth.

00:45:54 It seems to us that our little finger is weak, but that's not true at all.

00:45:57 Without it, you would lose 50% of the strength of your hand.

00:46:00 It usually works with your ring finger to give you power.

00:46:04 The other three are more suitable for catching things.

00:46:08 Just like the tip of your fingers, your tongue has a unique footprint,

00:46:11 but you can't use it to unlock your phone.

00:46:14 At least, not yet.

00:46:15 In addition, your tongue is full of fat.

00:46:17 If you gain weight, your tongue gains weight too.

00:46:19 There's acid in your stomach and it's used to break down food.

00:46:23 This acid is so powerful that it could make a piece of wood disappear.

00:46:27 The total length of all adult blood vessels is about 160,000 km,

00:46:32 which is four times the circumference of the equator.

00:46:34 During your life, you will produce enough saliva to fill two pools.

00:46:38 Our ancestors needed chicken meat to straighten their hair and scare their enemies.

00:46:44 We don't need it anymore, but we still have chicken meat.

00:46:47 One day, our evolution will make us lose this feature.

00:46:51 You probably never noticed it, but most of the time you only breathe through one nostril at a time.

00:46:56 Every few hours, your nostrils are connected.

00:46:58 That's why only one of your nostrils moves when you have a cold.

00:47:01 Most people think they have five senses, but that's not true.

00:47:05 Scientists are not yet sure, but they think there are more than 20.

00:47:08 There's sight, hearing, touch, smell, taste, and other senses like time, hunger, and thirst.

00:47:15 And then there's proprioception, the sense of your body's position in space.

00:47:19 The brain doesn't always differentiate between intense happiness and great sadness.

00:47:23 It understands that you feel a very strong emotion, but it's sometimes a little confused.

00:47:27 That's why you can cry when you're very happy.

00:47:29 Your eyes stay about the same size your whole life, but your nose and ears never stop growing.

00:47:34 The opposite would be really weird.

00:47:36 Once upon a time, all humans had brown eyes.

00:47:39 Other colors developed as a result of a fortuitous mutation.

00:47:42 Scientists think that if the first humans appeared on Earth about 6 million years ago,

00:47:47 the first person with blue eyes only appeared 100,000 years ago.

00:47:51 So it's quite likely that people with blue eyes are all the same ancestor.

00:47:54 Uncle Bob!

00:47:56 All the bones of the human body are connected to each other, except one.

00:47:59 The osteoid, in the shape of an "U", is at the base of the tongue to keep it in place.

00:48:04 The bones are more resistant than steel.

00:48:06 A healthy bone could theoretically support the weight of 5 trucks.

00:48:10 However, it's not the strongest part of the body.

00:48:13 The strongest element is the tooth enamel.

00:48:15 It's made of a lot of different materials that make it very resistant.

00:48:18 Teeth last a long time, several hundred years.

00:48:21 But of course, you still have to take care of them.

00:48:23 They are the only part of the body that cannot heal itself.

00:48:26 Your heart works non-stop, about 3 billion times in your life.

00:48:31 Just like your heart, your tongue never takes a vacation.

00:48:34 Even when you sleep, it helps to get saliva into your throat.

00:48:37 By the way, where do you put your tongue when you rest?

00:48:39 If you keep it at the bottom of your mouth, you make a mistake.

00:48:42 This position can cause neck and jaw pain.

00:48:46 If you keep it stuck against your teeth, you're wrong too.

00:48:49 It can move your teeth and cause chewing problems.

00:48:52 Try to keep it in the middle, about a centimeter from your teeth.

00:48:56 You can't breathe and swallow at the same time.

00:48:58 The reason is that the air we breathe and the things we swallow follow the same path.

00:49:03 At least at the beginning.

00:49:05 It's like a little guy driving traffic a little further.

00:49:08 Your eyes breathe too.

00:49:09 The cornea is the only part of the body that has no direct blood supply.

00:49:12 It receives its oxygen directly from the air.

00:49:15 That's why your eyes are irritated when it's dry outside.

00:49:18 Everyone dreams.

00:49:20 If some people say they've never dreamed once in their life,

00:49:23 it's just that they never remember their dreams.

00:49:26 Some scientists think that the dream stage is followed by an active forgetfulness stage.

00:49:30 Probably because the information contained in our dreams is not really important.

00:49:34 Our brain is economical.

00:49:35 It makes room for useful things.

00:49:37 Those who are lucky enough to remember their dreams

00:49:40 end up forgetting half of it in the five minutes that follow their awakening.

00:49:43 And after ten minutes, the dream has generally completely disappeared.

00:49:47 When you blush, the wall of your stomach turns red, too.

00:49:51 This happens because your blood circulates more when you are embarrassed,

00:49:54 your body preparing for something stressful to happen.

00:49:57 Your face and the wall of your stomach receive more, which makes them red.

00:50:02 In addition, humans are the only animals that can blush.

00:50:05 At least the only ones who have it so obvious.

00:50:07 Over a lifetime, a human will grow an average of 950 km of hair.

00:50:12 If he never shaved, a man would have a beard 9 meters long.

00:50:15 Hair grows a little faster in hot climates

00:50:18 because heat stimulates faster circulation in our body.

00:50:22 Everything you can know about yourself is written in one of your hair.

00:50:26 From a single hair, a scientist could say what you have eaten all your life

00:50:30 and in what type of environment you have lived.

00:50:32 On average, a human eats 45,000 kg of food throughout his life.

00:50:36 This represents about 10 big hippos.

00:50:39 The lips are one of the most sensitive parts of the human body.

00:50:43 It has a multitude of nerve endings, even more than your fingers.

00:50:47 In addition, the skin of the lips is very thin.

00:50:49 You can see the blood vessels inside.

00:50:51 That's why your lips are red or pink, unlike the rest of your body.

00:50:55 The lips are also very sensitive to damage caused by the sun.

00:50:59 So don't forget to apply a sunscreen.

00:51:01 This will protect them over time.

00:51:03 In addition to your fingerprints, your irises and your tongue,

00:51:06 your lip prints are also unique.

00:51:09 The total surface of your lungs is about the same as that of a tennis court.

00:51:13 The chin and the internals are real balls.

00:51:15 A chin can reach a speed of 80 km / h.

00:51:18 A blink is even faster, almost 160 km / h.

00:51:22 Unless you use your fingers, it is impossible to blink with your eyes open.

00:51:27 Scientists don't really know why.

00:51:30 Some say it's just a reflex, by definition uncontrollable.

00:51:33 Others think it's to protect your eyes from what's projected.

00:51:37 All humans literally shine.

00:51:39 This light comes from the heat of your body.

00:51:42 It is in fact a thousand times less intense than what you are able to perceive.

00:51:45 But still, it's pretty awesome.

00:51:48 The biggest USB key in the world is your brain.

00:51:50 Well, anyone's brain.

00:51:52 The neurons it contains combine with each other

00:51:54 so that your storage capacity is about 1 million giga-octets.

00:51:58 It is enough to contain 3 million hours of film.

00:52:01 Like a movie night that would last 300 years.

00:52:04 Pass me the popcorn.

00:52:06 You start to get thirsty when you lose about 1% of your body weight.

00:52:10 If you lose 5%, you can even feel like you're going to faint.

00:52:14 Fingers don't have their own muscles.

00:52:17 It's the muscles in the palm and forearm that make them move.

00:52:20 The word muscle actually comes from the old Latin word that means mouse.

00:52:24 The Romans saw their biceps like that.

00:52:26 On average, in their lifetime, a person walks about 180,000 km.

00:52:30 That's four times the distance around our planet

00:52:32 or half the distance between the Earth and the Moon.

00:52:35 So don't forget to wear comfortable shoes.

00:52:38 People who suffer from albinism have little or no melanin,

00:52:43 the pigment that colours hair, skin and eyes.

00:52:46 It's a rare disease.

00:52:48 In the United States, only 1 in 18,000 to 20,000 people suffer from this pathology.

00:52:53 But ocular albinism is even more unique.

00:52:56 Experts don't know the exact numbers,

00:52:58 but they think that only 1 in 50,000 people have it.

00:53:02 If a person has ocular albinism, only their eyes are affected.

00:53:06 Their skin and hair may be a little clearer than those of their family members,

00:53:10 but the difference is not that big.

00:53:12 The sun's light makes 17 to 35% of people go blind.

00:53:16 This phenomenon is called photosternitatory reflex.

00:53:20 In the Greek language, it's called sun's eclipse.

00:53:24 It happens when the nervous system doesn't function properly.

00:53:27 Indeed, when this happens, it's when one of the nerves is wrong in its reflexes.

00:53:32 Then, the sun's light not only makes the pupils contract,

00:53:35 but also activates the nose membranes.

00:53:38 In adults, light hair is rare.

00:53:40 It almost always turns dark as you get older.

00:53:43 People who are most likely to keep their hair light

00:53:46 are those who live in the North.

00:53:48 The Bajau are a group of nomads

00:53:50 who live in the waters of the Philippines, Indonesia and Malaysia.

00:53:54 Thanks to a rare mutation in their DNA,

00:53:56 they can stay underwater for up to 13 minutes.

00:54:00 The Bajau people have developed rats much larger than the average.

00:54:04 This particularity gives them a genetic advantage.

00:54:07 Sea nomads need them for fishing

00:54:10 or for underwater research that can be used in craftsmanship.

00:54:14 A particular genetic mutation gives them super-dense waters

00:54:18 that are almost impossible to break.

00:54:20 They are much more resistant than the waters of an average person.

00:54:23 The skin of these people is also less prone to aging.

00:54:27 It may seem cool, but there are also disadvantages.

00:54:31 When such hard waters develop,

00:54:33 they often exert too much pressure on the nerves around them and on the brain.

00:54:38 The eyes of an average person have three types of conical cells.

00:54:42 They help to recognize colors in blue, red and green spectra.

00:54:46 It is thanks to them that most people can distinguish about a million different shades.

00:54:51 But those who have tetrachromia have four cones in their eyes.

00:54:55 This feature allows them to see up to 100 million different shades.

00:55:00 As rare as this vision anomaly is,

00:55:03 it is still much more common in women than in men.

00:55:06 In fact, most people with tetrachromia

00:55:09 do not realize that they see the world more clearly than others.

00:55:12 A little over 8% of people have hair curls in the opposite direction of the needles of a watch.

00:55:18 A hair spiral can be simple or double.

00:55:21 Very few people have triple-spiral wicks, but they exist.

00:55:25 Experts do not all agree with this theory,

00:55:28 but some researchers claim that there is a link between the hand used and the direction of a hair wick.

00:55:34 Left-handed people are five times more likely to have a whirl in the opposite direction of the needles of a watch than right-handed people.

00:55:40 One in five people out of 10,000 only have an unusual shape pupil.

00:55:45 In most cases, it looks a bit like a lock hole or a cat's eye.

00:55:50 This eye disorder is called iris colobome.

00:55:53 Scientists believe that the origin is mainly genetic.

00:55:57 Supertasters are people who distinguish certain flavors more strongly than others.

00:56:02 They have more taste buds.

00:56:04 It is these little mushrooms-shaped bumps that cover the tongue.

00:56:08 They are covered with taste receptors that inform the brain of what we eat.

00:56:12 This feature also reinforces the sensitivity of supertasters to certain foods,

00:56:18 for example too sweet, bitter or salty.

00:56:21 They also have more pain receptors on the tongue.

00:56:24 This is why these people avoid spicy foods.

00:56:27 The figures vary throughout the world, but in general 25 to 30% of people are supertasters,

00:56:33 40 to 50% are medium tasters, and 25 to 30% are non-tasters.

00:56:39 These people have a bad taste perception.

00:56:42 Less than 1% of the world population is affected by a rare disease called dextrocardia.

00:56:48 This is when the heart is placed on the right side of the chest and not on the left side.

00:56:53 In rare cases, people with this unique quality have all their internal organs on the opposite side of the body.

00:57:00 One in five people out of 10,000 only have what is called a perfect or absolute pitch.

00:57:06 It is the ability to identify and recreate musical sounds.

00:57:10 This feature is often hereditary.

00:57:12 It is also more common among people who started their musical training before the age of 6.

00:57:18 Ancient Greeks told stories about fire-breathing creatures called chimeras.

00:57:23 They were a fearsome mixture of goats, lions and snakes.

00:57:27 In real life, chimeras are people who have two different DNA games.

00:57:32 Scientists have not found more than 100 cases of human chimerism.

00:57:36 The mutation of the gene DEC2 allows people to get by with only a few hours of sleep per night

00:57:42 and still feel in top shape.

00:57:45 These people who sleep little do not feel tired and never do the morning exercise.

00:57:50 They usually wake up at 4 or 5 in the morning.

00:57:53 Wow, not me!

00:57:55 Only 5% of people benefit from this feature.

00:57:58 Scientists at the University of California have also made an interesting discovery.

00:58:03 They say that people with the mutation DEC2 need less time to do certain tasks than normal sleepers.

00:58:11 Morton's toe is a type of foot whose second toe is longer than the first.

00:58:16 Only 3 to 22% of people in the world have such formed feet.

00:58:20 Michelangelo's David and the Statue of Liberty are among them.

00:58:24 Unlike the majority of the world population, 1.5% of people have only one palm fold.

00:58:30 It is the line that crosses the palm of the hand.

00:58:33 Men are more likely to have a single palm fold than women.

00:58:37 Most often, this feature is hereditary.

00:58:40 Only 3% of the world population have lines that form X-shaped letters on their two palms.

00:58:46 In many cultures, this rare feature is considered to be a sign of a strong personality.

00:58:52 One in 500 people has an additional coat called cervical.

00:58:56 The average man has two dozen coats, 12 on each side of the body.

00:59:00 But the lucky ones can have 25 or even 26.

00:59:04 Coats in excess are more common in women.

00:59:08 They are located in the region of the cervical column and develop just above the clavicles.

00:59:13 Their size can vary, ranging from barely developed to that of an adult.

00:59:17 In most cases, the cervical coats do not affect the well-being of the person, unless they become too big.

00:59:23 In this case, it could cause discomfort.

00:59:26 About 50 people have the Rh0 blood type, which is so precious that it has been nicknamed "gold blood".

00:59:34 It can be given to people who have incredibly rare blood types and who cannot accept any other.

00:59:40 Gold blood was first discovered in an Aboriginal Australian woman.

00:59:45 If you have a small hole near your ear, you are unique.

00:59:49 This phenomenon affects only 5% of people in the world.

00:59:52 In the United States, less than 1% of people are born with this hole.

00:59:56 In Asia and in some regions of Africa, the number is a little higher, as it is between 4 and 10%.

01:00:03 This characteristic is often genetically inherited.

01:00:06 It can manifest on one or two ears.

01:00:09 This distribution is 50/50.

01:00:12 The hole can go all the way, or it can be a faucet, a bump, or even a simple ball.

01:00:18 According to a theory, the small hole is a nativism that dates back to the time when all living beings had branches.

01:00:25 There is a genetic mutation that helps people maintain their bad cholesterol levels at an extremely low level.

01:00:31 In this case, the gene orders the body to produce a protein that reduces the amount of cholesterol in the blood.

01:00:38 Unfortunately, only 2 to 3% of people have this useful ability.

01:00:43 About 65% of the world's population has digital loops-shaped fingerprints.

01:00:48 Another 30% has spiral-shaped fingerprints.

01:00:52 And only 5% of people have digital arches-shaped fingerprints.

01:00:57 These can be simple or arch-shaped.

01:01:00 About 35% of the world's population is spared from pain and discomfort related to wisdom teeth that pierce the gums.

01:01:08 Simply because they don't have any.

01:01:10 But about 5 million less fortunate people have to have their wisdom teeth removed every year.

01:01:16 Some people have more than one row of teeth.

01:01:19 This phenomenon is a genetic mutation called dystichiasis.

01:01:23 A person affected by this disease has a second series of teeth that grow behind the first.

01:01:28 All these thick and abundant teeth are really beautiful, but they can also cause some discomfort.

01:01:34 The hairs can start growing in the wrong direction or in the place where a uropygian gland is supposed to be.

01:01:40 This can cause irritation and tears.

01:01:43 Experts are convinced that the people of Tibet have genetically mutated to be able to live at high altitudes.

01:01:49 They have a gene that helps them adapt to the drop in oxygen levels at a staggering rate.

01:01:55 This evolutionary mutation was one of the fastest ever recorded in man.

01:02:00 It took only 3,000 years for it to develop.

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01:03:48 but your brain ignores the information that reaches it.

01:03:51 The distance between your arms is equal to your height.

01:03:55 You renew your skeleton every ten years.

01:03:57 You lose a hundred hairs a day, and that's perfectly normal.

01:04:01 Humans are the only creatures that sleep on their backs for a long time.

01:04:06 Koalas, like humans, have their own fingerprints.

01:04:10 The fingerprints of your tongue are also clean, but let's not forget the scanner.

01:04:15 Scientists at the University of Pittsburgh have discovered that people with blue and green eyes

01:04:20 are less sensitive to pain than people with brown eyes.

01:04:24 But light-eyed people are more sensitive to light than dark-eyed people.

01:04:28 The microorganisms in the human body are ten times more numerous than these cells.

01:04:32 And all together, all the bacteria in your body weigh about 1.8 kilograms.

01:04:37 The nail that develops the fastest is the middle one.

01:04:41 The slower, the bigger.

01:04:43 Blondes have more hair than brunettes and redheads.

01:04:46 Your ability to distinguish smells disappears when you sleep.

01:04:50 There is enough iron in the body to make a nail 7 centimeters long.

01:04:55 Without the little finger, your hand would lose half of its strength,

01:04:58 no matter how you lost it. Ouch!

01:05:01 People can't digest grass.

01:05:03 Cows can, because they have four stomachs.

01:05:06 The mind generates about 70,000 thoughts a day.

01:05:10 A man will grow 15 meters of beard in one life, the height of a telephone pole.

01:05:15 It takes a minute for our 5 liters of blood to circulate in the body.

01:05:20 During a lifetime, an average person will do the equivalent of walking around the world three times.

01:05:25 A person can have from 250 to more than 1,000 hairs per eyebrow.

01:05:29 Your eyebrows also have a lifespan of about 4 months

01:05:32 for all the hairs to fall and be replaced by new ones.

01:05:35 Phew, fortunately!

01:05:37 Eyes are the only organ that does not grow with age.

01:05:41 Your body shines in the dark, it's just too weak for you to see it.

01:05:46 99% of the body's calcium is in the teeth and bones.

01:05:50 The human eye can distinguish up to 10 million different colors.

01:05:54 Most people will spend 4 months of their lives waiting for the traffic lights to go out.

01:05:58 What a waste of time!

01:06:00 The muscles of your iris contract and expand to determine the size of your pupils.

01:06:05 Your pupils become larger when you look at someone who attracts you.

01:06:09 Your skin covers an area of 2 square meters.

01:06:12 The thickest skin is on the plant of your feet, the thinnest on your eyelids.

01:06:18 Your stomach reddens when you play in the background.

01:06:20 The only part of the human body that cannot reestablish itself is the teeth.

01:06:25 People can have up to 7,000 different facial expressions,

01:06:29 like this one,

01:06:30 or this one,

01:06:31 or even this one.

01:06:33 The largest organ of the human body is the skin, which weighs 9 kilos.

01:06:37 You cannot blink or breathe while you're eating.

01:06:41 That's how it is.

01:06:42 The bumps on your tongue are papillae.

01:06:45 All papillae do not contain taste buds,

01:06:48 but those that do can have one to five each.

01:06:52 Your bones are composed of 30% water.

01:06:55 The atoms of your body are made up of empty 99%.

01:06:59 And yet, you feel full after dinner. How does that happen?

01:07:03 The brain develops during the first 18 years of life,

01:07:06 then decreases by 5% every 10 years, after 40 years.

01:07:10 That explains a lot of things, don't you think?

01:07:12 Your stomach is generally one liter big,

01:07:14 but it can stretch to contain four liters.

01:07:18 We spend 10% of our waking hours with our eyes closed,

01:07:21 just to wink.

01:07:23 The muscles that make our fingers work are actually in our forearm.

01:07:27 Your foot is the same length as your forearm.

01:07:30 Same ratio with your thumb and your nose.

01:07:33 With proper training,

01:07:34 a single finger could support the entire weight of your body.

01:07:38 Your toenails grow three times slower than your fingernails.

01:07:42 Your lungs are not identical.

01:07:43 The one on the right has three lobes, and the one on the left has two.

01:07:47 Your hair grows faster when you sleep.

01:07:50 The only thing that grows faster than hair is the bone marrow.

01:07:54 The tooth enamel is the hardest tissue in your body.

01:07:57 Your bones are four times more resistant than concrete.

01:08:01 On average, a person drinks enough water during their lifetime

01:08:03 to fill 150 jacuzzis.

01:08:06 You have a unique smell.

01:08:09 People lose half of their taste buds by the age of 60.

01:08:13 Your body releases enough heat in half an hour

01:08:16 to boil two liters of water.

01:08:18 Your brain uses 20% of the energy that your body produces.

01:08:22 Your body uses more energy to cool off on hot days

01:08:26 than to warm up when it's cold.

01:08:28 People can stay much longer without food than without sleep.

01:08:32 The stomach acid can dissolve metals.

01:08:35 It's so strong that the stomach has to build a new wall every 3 to 4 days.

01:08:39 So what's bothering you?

01:08:42 The strongest ever recorded inflation was 93 decibels.

01:08:46 Stronger than a lawn mower.

01:08:48 Yeah, I think it was in my house.

01:08:51 A single DNA molecule in a cell is 2 meters long.

01:08:55 If you could unwind all the DNA in your body,

01:08:57 it would go back and forth to Pluto.

01:08:59 Except Pluto is no longer a planet.

01:09:02 The rule of three states that the human body can spend 3 minutes without air,

01:09:06 3 days without water, and 3 weeks without food.

01:09:09 But not 3 seconds without the internet.

01:09:12 Your brain forgets information to think faster

01:09:15 and protect itself from emotional overload.

01:09:18 Our eyes can see the flame of a candle up to 50 km a day.

01:09:23 Human DNA is 96% like that of a chimpanzee,

01:09:27 90% like that of a cat,

01:09:29 70% like that of a slug,

01:09:32 and 50% like that of a banana.

01:09:34 It's a lot!

01:09:36 You share 99.9% of your DNA with any person on the planet.

01:09:42 A printed version of your complete genetic code

01:09:45 would have more than 260,000 pages,

01:09:47 which represents about 200 big books.

01:09:50 In terms of muscles, your tongue is like an elephant's trunk

01:09:53 and a octopus tentacle.

01:09:55 Uh, OK.

01:09:57 Your nails are made of the same material as a rhinoceros' horn

01:10:00 and a horse's hooves.

01:10:02 And the rhinoceros would like to get it back.

01:10:06 We have nails to protect the tip of our fingers.

01:10:09 Without them, it would be more difficult to grab things.

01:10:12 You use 200 muscles just to take a step

01:10:15 and 50 muscles just to use chopsticks.

01:10:19 You use two fingers to play Chopsticks on the piano.

01:10:23 The word "muscles" means "small mouse" in Latin,

01:10:26 because that's what a flying bicep looked like

01:10:28 according to the Romans of Antiquity.

01:10:30 The surface of the body could contain 110,000 mosquitoes at a time

01:10:34 and feed 15 million.

01:10:35 Volunteers around here?

01:10:38 Most people pronounce about 125 words per minute.

01:10:42 The brain can process 800 at the same time.

01:10:45 I can do up to 185,

01:10:47 with gusts of wind up to 250.

01:10:50 Your skin is completely renewed every 27 days.

01:10:53 You can't chat.

01:10:55 Your brain already knows your intentions

01:10:57 and prepares your body for it.

01:11:00 Humans are the only species

01:11:01 with a contour that separates the lips from the surrounding skin.

01:11:06 Your lips are red or pink

01:11:07 because there are tons of hair just under their thin skin.

01:11:11 Your ears produce more human wax when you're scared.

01:11:14 I must be terrified!

01:11:17 The information travels to and from the brain

01:11:20 at a speed of 435 km/h,

01:11:22 faster than an arrow.

01:11:25 The smallest bone and the smallest muscle in your body

01:11:28 are both in your ear.

01:11:31 Your head weighs 4.5 kilos.

01:11:34 Your eyes breathe.

01:11:36 Yep, the cornea is the only part of you that doesn't have a blood supply.

01:11:39 It receives oxygen directly from the air.

01:11:43 Shark's corneas are so similar to those of humans

01:11:46 that they could be used for transplantation.

01:11:49 Half of your body's water is in your feet and hands.

01:11:53 Come on, let's share, guys!

01:11:55 Finally, corneas have more genes than people.

01:11:58 Your cereals have 32,000.

01:12:00 You have 20,000.

01:12:01 Wow, you'd need a very large closet to hold 20,000 jeans.

01:12:06 Uh, okay, I'm out.

01:12:09 See you later.

01:12:11 Hey, listen to this.

01:12:13 You know, your bones are designed to be extremely demanding on a daily basis.

01:12:16 Some of them can absorb the force of two or even three times the weight of your body.

01:12:22 It's impressive, but your teeth are even stronger.

01:12:25 When you bite something, they can withstand an incredible pressure,

01:12:28 up to 90.5 kilos.

01:12:30 Besides, the enamel is considered to be part of your skeleton.

01:12:34 Every time you pivot your hand, the bones of your forearm cross.

01:12:38 Grab your arm and turn the apple of your hand up and down.

01:12:41 You'll see it's true.

01:12:43 Not only is your body made up of 60% water,

01:12:46 but your bones also contain liquid.

01:12:48 About 25% of the bone mass of a human being is made up of water.

01:12:51 The human eye has something in common with the motor of a car.

01:12:54 Both can't function properly without various liquids.

01:12:58 The eye needs tears as much as the motor needs oil.

01:13:01 Tears must be evenly distributed over the surface of the eye.

01:13:04 That's why you blink your eyes up to 20,000 times a day.

01:13:08 And your eyelid acts as an ice cream scoop.

01:13:10 The only part of the human body that doesn't receive blood nutrients is the cornea,

01:13:15 the front surface that covers the eye.

01:13:17 It's fed by tears on the outside and special fluids inside.

01:13:22 When you blush, it means that the blood flow in your body increases.

01:13:25 So it's not just your cheeks, but also the wall of your stomach that turns red.

01:13:30 It's because there are a lot of blood vessels.

01:13:32 When there's more blood than usual in these vessels, the wall blushes.

01:13:36 The wall of your stomach is replaced every three or four days.

01:13:40 This prevents the organ from eating itself.

01:13:42 The digestive acids in it are exceptionally powerful.

01:13:45 People can accidentally swallow small objects,

01:13:48 like plastic pieces, glass, coins, and many more.

01:13:52 Normally, they don't cause any damage and go through the digestive tube

01:13:55 to evacuate in 48 hours.

01:13:57 Small amounts of plastic that you could accidentally consume won't hurt you.

01:14:01 But on the other hand, your stomach will have trouble digesting the grass.

01:14:05 Pest animals have special teeth and stomachs to treat leaves and fresh grass.

01:14:10 But people, they, are not equipped that way.

01:14:13 But they...

01:14:15 The stomach is the most important protector of the immune system.

01:14:18 It contains chloride acid.

01:14:20 This acid eliminates the dangerous food toxins,

01:14:23 viruses and bacteria that accompany the food you eat.

01:14:26 The stomach itself would be digested by this powerful acid

01:14:29 if its mucous membrane didn't protect it.

01:14:32 You have two really fast muscles.

01:14:34 They control the closure of your eyelids.

01:14:36 They are the fastest of your body.

01:14:38 Your eyes are fragile and need to be protected.

01:14:40 When a particular reflex is triggered,

01:14:42 for example, when something suddenly touches your eye,

01:14:45 these muscles only need a tenth of a second

01:14:48 to close your eyelids and protect your eye.

01:14:51 Women usually blink more often than men.

01:14:54 And the older you get, the more you do it.

01:14:56 Besides, when you watch a movie with a friend,

01:14:58 you probably both blink at the same time.

01:15:01 Do you think you owe your firm hand to your muscle exercises?

01:15:04 Nope.

01:15:05 It's thanks to your little finger.

01:15:07 I'm kidding.

01:15:07 And yet, the ear is the strongest finger there is.

01:15:10 It is responsible for 50% of the strength of the hand.

01:15:14 But the most used finger is the thumb.

01:15:16 If a person loses it,

01:15:17 his hand becomes 40% less agile.

01:15:20 Oh, and the thumb has its own skin,

01:15:22 thanks to the artery it goes through.

01:15:24 Your big toes carry more than 40% of your weight.

01:15:27 More than all the other toes combined.

01:15:29 In reality, all your toes are very important.

01:15:31 They provide support and balance when you walk.

01:15:34 And when you run, they help you be faster.

01:15:36 No more than 2% of people have natural brown hair.

01:15:39 They are followed by blondes, about 3%,

01:15:42 and by all kinds of shades of brown, about 11%.

01:15:45 But the most common hair colors in the world

01:15:47 are black and dark brown.

01:15:49 Hair is almost indestructible.

01:15:51 They can be burned or affected by strong acids,

01:15:53 but that's about all you can do to destroy them.

01:15:57 Your hair usually stops growing at a certain length.

01:16:00 And since a hair grows from 2 to 7 years,

01:16:02 its length usually does not exceed 106 cm.

01:16:05 Tell this to this lady,

01:16:07 Xi Jinping, from China,

01:16:08 who broke the Guinness World Record

01:16:10 with the longest hair of all time.

01:16:12 In 2004, they were 5 meters long.

01:16:15 Wow!

01:16:16 Nails can also become super long.

01:16:18 Some of the world's longest nails

01:16:19 belonged to an Indian,

01:16:21 Sridhar Shelal.

01:16:22 Their total length was 9 meters,

01:16:24 which is almost as long as a two-story red bus in London.

01:16:27 The man cut them in 2018.

01:16:30 Nails help us catch small objects

01:16:32 and take off stickers.

01:16:34 But that's not all.

01:16:35 If you didn't have a rigid structure

01:16:37 against which to lean,

01:16:38 you wouldn't be able to understand

01:16:39 how firmly you should hold things.

01:16:42 It's not just your hair and nails

01:16:43 that can grow, but also your liver.

01:16:46 It's the largest internal organ in terms of mass.

01:16:48 The liver can regenerate completely,

01:16:50 going from only 51% of its initial mass

01:16:53 to its maximum size.

01:16:55 And at the same time,

01:16:55 constant damage to the liver

01:16:57 leads to scars.

01:16:59 The most important organ of your body is the skin.

01:17:01 It represents more than 15% of your total weight.

01:17:04 People lose 30,000 to 40,000 skin cells

01:17:07 every minute.

01:17:08 This represents up to 4 kilos of cutaneous cells per year.

01:17:12 You know this dust in your house?

01:17:13 Well, now you know where some of it comes from.

01:17:16 The tongue is not the only organ

01:17:18 that helps you recognize your taste.

01:17:19 Your nose also plays a crucial role in this process.

01:17:22 It is often said that the nose is responsible

01:17:24 for 75 to 95% of the perception of taste.

01:17:27 Try to pinch your nose

01:17:28 the next time you eat,

01:17:29 bite into an onion or eat smoked fish.

01:17:32 It's not that you won't taste anything,

01:17:34 but it will be much more dull.

01:17:35 Your taste buds won't work properly

01:17:38 if your mouth is too dry.

01:17:40 You won't taste as much

01:17:41 until the food is not covered in saliva.

01:17:44 It contains enzymes,

01:17:45 which are complex protein molecules.

01:17:47 They begin to break down your food

01:17:49 as soon as it enters your mouth.

01:17:51 A recent study has shown

01:17:52 that people can distinguish more than a billion smells.

01:17:55 You tend to remember smells better

01:17:57 than sounds or images.

01:17:58 That's why smells can evoke distant memories.

01:18:01 When you sleep, you don't smell anything.

01:18:04 Basically, your sense of smell goes off at night.

01:18:07 Even if there is a terrible smell in your room,

01:18:09 you won't notice it.

01:18:10 I'm sure my dog is relieved to hear that.

01:18:13 The color of your dreams seems to be affected

01:18:15 by the television you watched when you were a child.

01:18:17 If it was mostly white,

01:18:19 you would have monochrome dreams.

01:18:21 If you are used to color TV,

01:18:23 your dreams will probably be colored.

01:18:26 What kind of dreams did people have in the Middle Ages?

01:18:28 Your heart can betray you when you lie,

01:18:30 starting to beat faster.

01:18:32 Women's hearts are generally smaller than men's.

01:18:34 That's why they have to work harder and beat more.

01:18:37 Otherwise, they won't be able to pump enough blood.

01:18:41 Even if you brush your teeth twice a day

01:18:43 and never forget to bathe,

01:18:44 your mouth remains one of the dirtiest parts of your body.

01:18:47 Millions of bacteria live there.

01:18:49 The good news is that most of them are good for your health.

01:18:52 They protect your body from bad bacteria and viruses.

01:18:55 The second dirtiest part is your navel.

01:18:58 You don't really use it after you're born.

01:19:00 This area accumulates all kinds of germs,

01:19:03 sweat and dirt.

01:19:04 The navel has more than 2,300 bacterial species

01:19:08 and requires special attention.

01:19:10 It is said that the eyes do not grow with the rest of the body.

01:19:13 But that's not 100% true

01:19:14 because the eyes are not fully developed

01:19:16 before the age of 21.

01:19:18 But the absolute champions of growth here

01:19:20 are your ears and your nose.

01:19:22 They keep growing.

01:19:23 Wow, what was that thing with the elephants?

01:19:26 Ah, that must have been another video.

01:19:28 If all your blood vessels were spread out on a single line,

01:19:32 you'd be in trouble.

01:19:33 However, they would go around the earth four times.

01:19:37 You can't get a guillotine, no matter how hard you try.

01:19:40 You just checked and you failed, right?

01:19:42 It's because your brain tells you

01:19:43 that you're about to be tickled.

01:19:45 Which it can't do if it's someone else who's sticking to it.

01:19:49 Have you ever wondered why you fall asleep after lunch?

01:19:51 One of the reasons is the circadian rhythm

01:19:53 that works according to a 24-hour cycle.

01:19:55 It requires you to take a nap 7 hours after you wake up.

01:19:58 And food only adds to this effect.

01:20:01 It's as simple as that.

01:20:03 Oops, sorry, it's time.

01:20:05 [snoring]

01:20:07 The human body is a perfectly balanced machine, isn't it?

01:20:12 Well, not really in my case.

01:20:14 Normally, all these parts work perfectly together

01:20:17 to allow us to prosper

01:20:19 and, of course, to stay alive.

01:20:21 Each of our organs is essential to our daily activities,

01:20:24 whether it's breathing, walking, talking

01:20:27 or finding brilliant ideas that make humanity advance.

01:20:30 But are they really essential?

01:20:33 Do we really need all these parts of the body?

01:20:36 Or are some of them just old relics

01:20:39 that we came across during this strange game?

01:20:42 What evolution?

01:20:44 The wisdom teeth, for example.

01:20:46 Well, I've been taken them off for a long time.

01:20:48 And yes, these are those pairs of teeth stuck at the bottom of the mouth

01:20:52 that you often have to go to the dentist for.

01:20:54 They are also called the third molar.

01:20:57 And, although they can be used to chew food,

01:21:00 many people think they are simply useless.

01:21:04 And know that about 22% of people in the world

01:21:07 don't even have these four molars in their rabe.

01:21:09 When they grow, they are likely to be included.

01:21:13 Which means they stay stuck in the bone of the jaw

01:21:16 and can't get out of the gums properly.

01:21:19 All this because our jaws are often too small to accommodate them.

01:21:23 Some scientists warned, think so,

01:21:26 that it is because we have evolved towards narrower jaws over time.

01:21:30 Recent data also show that

01:21:32 what we eat when we are children

01:21:34 could also be at risk,

01:21:36 but it is difficult to be sure.

01:21:38 Apparently, consuming difficult foods to chew,

01:21:42 such as raw vegetables and nuts,

01:21:44 can stimulate the growth of the jaws,

01:21:46 while consuming soft and transformed food

01:21:50 can somehow slow it down.

01:21:51 This leaves little room for the teeth at the bottom to develop.

01:21:55 Will they completely disappear in the future?

01:21:57 I guess we, humanoid mammals,

01:22:00 will have to wait to see what they estimate.

01:22:03 Now, let's talk about the vomeronasal organ,

01:22:06 or, as I like to call it, the secret instrument of the nose.

01:22:09 You see, rodents and other mammals

01:22:12 have this formidable ability to communicate with each other

01:22:15 thanks to chemical signals called pheromones.

01:22:18 And guess what?

01:22:19 They have a special organ,

01:22:21 the vomeronasal organ, or OVN,

01:22:23 which helps them detect these pheromones.

01:22:25 This is where things get interesting.

01:22:28 While most adult human beings

01:22:30 have something that looks like an OVN in their nose,

01:22:34 it turns out that it is essentially a useless vestige.

01:22:37 Neuroscientists even claim

01:22:39 that if we examine the anatomy of this organ,

01:22:42 we can't tell any cell from another

01:22:44 that looks like similar organs in other mammals.

01:22:47 Moreover, in humans,

01:22:48 this organ doesn't seem to communicate with the brain.

01:22:51 There's not only bad news, however.

01:22:53 Even if the human OVN has little interest,

01:22:56 it seems that it can still react to certain pheromones.

01:23:00 Will humans keep this organ

01:23:02 on their list of evolutionary projects?

01:23:04 For now, let's put it in the pile of "maybes".

01:23:07 And now, here's a little story.

01:23:10 Animals with a tail need this structure for many reasons.

01:23:14 Some need it for their balance,

01:23:16 others to move,

01:23:17 others to attract potential partners.

01:23:20 But did you know that when we are a few weeks older

01:23:23 in our mother's womb, we also have a tail?

01:23:26 That's right.

01:23:27 We have a small tail, complete with its own vertebrae.

01:23:30 As we grow up,

01:23:32 this tail disappears like magic,

01:23:34 and we only have our faithful coccyx.

01:23:37 Humans and great apes have the particularity

01:23:40 of not having a tail, unlike other primates.

01:23:43 The reason why great apes have lost their tails

01:23:46 remains a mystery.

01:23:48 But we all agree that it distinguishes us

01:23:51 from baboons and other macaques.

01:23:53 However, from time to time,

01:23:55 a human is born with a small vestigial tail.

01:23:58 It's cute, isn't it?

01:24:00 But don't get too excited,

01:24:02 because these tails don't have vertebrae

01:24:04 and can sometimes be associated

01:24:06 with a pathology of the spine.

01:24:08 Anyway, these tails are generally harmless

01:24:11 and can be easily removed

01:24:13 by a quick surgical intervention.

01:24:15 And let's be honest,

01:24:17 it's not like we're going to miss it.

01:24:19 After all, who needs a tail

01:24:21 when you have arms and legs to move?

01:24:24 And then, can you only imagine

01:24:26 trying to find pants your size

01:24:28 with a tail that protrudes in the back?

01:24:30 It's not very aesthetic.

01:24:32 There is little chance that man

01:24:34 will need a tail in the future.

01:24:36 So I guess future generations

01:24:38 can already say goodbye to these tails.

01:24:40 Humans also have a funny little membrane fold

01:24:43 in the inner corner of the eyes

01:24:45 called the semilunar fold of the conjunctive.

01:24:48 It is actually a CE that remains

01:24:50 of a third eyelid,

01:24:52 which is still found in some animals,

01:24:54 such as gorillas and other primates.

01:24:56 But the most curious thing is that

01:24:58 even our close relatives,

01:25:00 chimpanzees, have this little fold

01:25:02 that seems useless.

01:25:04 So we are not the only ones

01:25:06 to have this bizarre eye fold.

01:25:08 Speaking of unusual membranes,

01:25:10 they fulfill various functions

01:25:12 in different animals,

01:25:14 such as eye protection

01:25:16 against dirt and humidity

01:25:18 or iris dissemination against predators.

01:25:20 Some species can even see

01:25:22 through their transparent membranes

01:25:24 when they are underwater or underground.

01:25:26 Now, the reason why we humans

01:25:28 have lost our third eyelid

01:25:30 remains a bit mysterious.

01:25:32 Maybe the evolution of our habitat

01:25:34 and the physiology of our eyes

01:25:36 made it useless.

01:25:38 Or maybe we became too cool

01:25:40 to have a third eyelid.

01:25:42 Who knows?

01:25:44 With or without vestigial organs,

01:25:46 it is interesting to imagine

01:25:48 what humans could look like in the future.

01:25:50 Many organs have become obsolete

01:25:52 due to the evolution of our lifestyle.

01:25:54 Would you like to take a look

01:25:56 at what we could look like

01:25:58 in the future?

01:26:00 And in the same vein or artery,

01:26:02 have you ever heard of the concept

01:26:04 of the "textile claw"?

01:26:06 It is when you spend so much time

01:26:08 typing on your phone or laptop

01:26:10 that your hand starts to have cramps

01:26:12 that give it a form of claw.

01:26:14 And this is just one of the physical changes

01:26:16 that could happen to us

01:26:18 if we do not take care of our body

01:26:20 in this world dominated by technology.

01:26:22 But our hands are not the only ones concerned.

01:26:24 We are also concerned with our elbows

01:26:26 at 90 degrees by constantly holding

01:26:28 our devices at this angle.

01:26:30 And even a smaller brain

01:26:32 because of all the distractions

01:26:34 and overload of information.

01:26:36 Well, I know what you're thinking.

01:26:38 We're not going to give up technology

01:26:40 and go back to the Stone Age.

01:26:42 And you're probably right.

01:26:44 We don't have to get there.

01:26:46 But we have to be aware

01:26:48 of the potential negative effects

01:26:50 and take measures to reduce them.

01:26:52 And that's why I'm here to talk to you

01:26:54 about the future of our bodies.

01:26:56 I'm going to talk to you about

01:26:58 the future of our bodies.

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01:36:18 the future of our bodies.

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01:36:22 the future of our bodies.

01:36:24 I'm going to talk to you about

01:36:26 the future of our bodies.

01:36:28 I'm going to talk to you about

01:36:30 the future of our bodies.

01:36:32 I'm going to talk to you about

01:36:34 the future of our bodies.

01:36:36 I'm going to talk to you about

01:36:38 the future of our bodies.

01:36:40 I'm going to talk to you about

01:36:42 the future of our bodies.

01:36:44 I'm going to talk to you about

01:36:46 the future of our bodies.

01:36:48 I'm going to talk to you about

01:36:50 the future of our bodies.

01:36:52 I'm going to talk to you about

01:36:54 the future of our bodies.

01:36:56 I'm going to talk to you about

01:36:58 the future of our bodies.

01:37:00 I'm going to talk to you about

01:37:02 the future of our bodies.

01:37:04 I'm going to talk to you about

01:37:06 the future of our bodies.

01:37:08 I'm going to talk to you about

01:37:10 the future of our bodies.

01:37:12 I'm going to talk to you about

01:37:14 the future of our bodies.

01:37:16 I'm going to talk to you about

01:37:18 the future of our bodies.

01:37:20 I'm going to talk to you about

01:37:22 the future of our bodies.

01:37:24 I'm going to talk to you about

01:37:26 the future of our bodies.

01:37:28 I'm going to talk to you about

01:37:30 the future of our bodies.

01:37:32 I'm going to talk to you about

01:37:34 the future of our bodies.

01:37:36 I'm going to talk to you about

01:37:38 the future of our bodies.

01:37:40 I'm going to talk to you about

01:37:42 the future of our bodies.

01:37:44 I'm going to talk to you about

01:37:46 the future of our bodies.

01:37:48 I'm going to talk to you about

01:37:50 the future of our bodies.

01:37:52 I'm going to talk to you about

01:37:54 the future of our bodies.

01:37:56 I'm going to talk to you about

01:37:58 the future of our bodies.

01:38:00 I'm going to talk to you about

01:38:02 the future of our bodies.

01:38:04 I'm going to talk to you about

01:38:06 the future of our bodies.

01:38:08 I'm going to talk to you about

01:38:10 the future of our bodies.

01:38:12 I'm going to talk to you about

01:38:14 the future of our bodies.

01:38:16 I'm going to talk to you about

01:38:18 the future of our bodies.

01:38:20 I'm going to talk to you about

01:38:22 the future of our bodies.

01:38:24 I'm going to talk to you about

01:38:26 the future of our bodies.

01:38:28 I'm going to talk to you about

01:38:30 the future of our bodies.

01:38:32 I'm going to talk to you about

01:38:34 the future of our bodies.

01:38:36 I'm going to talk to you about

01:38:38 the future of our bodies.

01:38:40 I'm going to talk to you about

01:38:42 the future of our bodies.

01:38:44 I'm going to talk to you about

01:38:46 the future of our bodies.

01:38:48 I'm going to talk to you about

01:38:50 the future of our bodies.

01:38:52 I'm going to talk to you about

01:38:54 the future of our bodies.

01:38:56 I'm going to talk to you about

01:38:58 the future of our bodies.

01:39:00 I'm going to talk to you about

01:39:02 the future of our bodies.

01:39:04 I'm going to talk to you about

01:39:06 the future of our bodies.

01:39:08 I'm going to talk to you about

01:39:10 the future of our bodies.

01:39:12 I'm going to talk to you about

01:39:14 the future of our bodies.

01:39:16 I'm going to talk to you about

01:39:18 the future of our bodies.

01:39:20 I'm going to talk to you about

01:39:22 the future of our bodies.

01:39:24 I'm going to talk to you about

01:39:26 the future of our bodies.

01:39:28 I'm going to talk to you about

01:39:30 the future of our bodies.

01:39:32 I'm going to talk to you about

01:39:34 the future of our bodies.

01:39:36 I'm going to talk to you about

01:39:38 the future of our bodies.

01:39:40 I'm going to talk to you about

01:39:42 the future of our bodies.

01:39:44 I'm going to talk to you about

01:39:46 the future of our bodies.

01:39:48 I'm going to talk to you about

01:39:50 the future of our bodies.

01:39:52 I'm going to talk to you about

01:39:54 the future of our bodies.

01:39:56 I'm going to talk to you about

01:39:58 the future of our bodies.

01:40:00 I'm going to talk to you about

01:40:02 the future of our bodies.

01:40:04 I'm going to talk to you about

01:40:06 the future of our bodies.

01:40:08 I'm going to talk to you about

01:40:10 the future of our bodies.

01:40:12 I'm going to talk to you about

01:40:14 the future of our bodies.

01:40:16 I'm going to talk to you about

01:40:18 the future of our bodies.

01:40:20 I'm going to talk to you about

01:40:22 the future of our bodies.

01:40:24 I'm going to talk to you about

01:40:26 the future of our bodies.

01:40:28 I'm going to talk to you about

01:40:30 the future of our bodies.

01:40:32 I'm going to talk to you about

01:40:34 the future of our bodies.

01:40:36 I'm going to talk to you about

01:40:38 the future of our bodies.

01:40:40 I'm going to talk to you about

01:40:42 the future of our bodies.

01:40:44 I'm going to talk to you about

01:40:46 the future of our bodies.

01:40:48 I'm going to talk to you about

01:40:50 the future of our bodies.

01:40:52 I'm going to talk to you about

01:40:54 the future of our bodies.

01:40:56 I'm going to talk to you about

01:40:58 the future of our bodies.

01:41:00 I'm going to talk to you about

01:41:02 the future of our bodies.

01:41:04 I'm going to talk to you about

01:41:06 the future of our bodies.

01:41:08 I'm going to talk to you about

01:41:10 the future of our bodies.

01:41:12 I'm going to talk to you about

01:41:14 the future of our bodies.

01:41:16 I'm going to talk to you about

01:41:18 the future of our bodies.

01:41:20 I'm going to talk to you about

01:41:22 the future of our bodies.

01:41:24 I'm going to talk to you about

01:41:26 the future of our bodies.

01:41:28 I'm going to talk to you about

01:41:30 the future of our bodies.

01:41:32 I'm going to talk to you about

01:41:34 the future of our bodies.

01:41:36 I'm going to talk to you about

01:41:38 the future of our bodies.

01:41:40 I'm going to talk to you about

01:41:42 the future of our bodies.

01:41:44 I'm going to talk to you about

01:41:46 the future of our bodies.

01:41:48 I'm going to talk to you about

01:41:50 the future of our bodies.

01:41:52 I'm going to talk to you about

01:41:54 the future of our bodies.

01:41:56 I'm going to talk to you about

01:41:58 the future of our bodies.

01:42:00 I'm going to talk to you about

01:42:02 the future of our bodies.

01:42:04 I'm going to talk to you about

01:42:06 the future of our bodies.

01:42:08 I'm going to talk to you about

01:42:10 the future of our bodies.

01:42:12 I'm going to talk to you about

01:42:14 the future of our bodies.

01:42:16 I'm going to talk to you about

01:42:18 the future of our bodies.

01:42:20 I'm going to talk to you about

01:42:22 the future of our bodies.

01:42:24 I'm going to talk to you about

01:42:26 the future of our bodies.

01:42:28 I'm going to talk to you about

01:42:30 the future of our bodies.

01:42:32 I'm going to talk to you about

01:42:34 the future of our bodies.

01:42:36 I'm going to talk to you about

01:42:38 the future of our bodies.

01:42:40 I'm going to talk to you about

01:42:42 the future of our bodies.

01:42:44 I'm going to talk to you about

01:42:46 the future of our bodies.

01:42:48 I'm going to talk to you about

01:42:50 the future of our bodies.

01:42:52 I'm going to talk to you about

01:42:54 the future of our bodies.

01:42:56 I'm going to talk to you about

01:42:58 the future of our bodies.

01:43:00 I'm going to talk to you about

01:43:02 the future of our bodies.

01:43:04 I'm going to talk to you about

01:43:06 the future of our bodies.

01:43:08 I'm going to talk to you about

01:43:10 the future of our bodies.

01:43:12 I'm going to talk to you about

01:43:14 the future of our bodies.

01:43:16 I'm going to talk to you about

01:43:18 the future of our bodies.

01:43:20 I'm going to talk to you about

01:43:22 the future of our bodies.

01:43:24 I'm going to talk to you about

01:43:26 the future of our bodies.

01:43:28 I'm going to talk to you about

01:43:30 the future of our bodies.

01:43:32 I'm going to talk to you about

01:43:34 the future of our bodies.

01:43:36 I'm going to talk to you about

01:43:38 the future of our bodies.

01:43:40 I'm going to talk to you about

01:43:42 the future of our bodies.

01:43:44 I'm going to talk to you about

01:43:46 the future of our bodies.

01:43:48 I'm going to talk to you about

01:43:50 the future of our bodies.

01:43:52 I'm going to talk to you about

01:43:54 the future of our bodies.

01:43:56 I'm going to talk to you about

01:43:58 the future of our bodies.

01:44:00 I'm going to talk to you about

01:44:02 the future of our bodies.

01:44:04 I'm going to talk to you about

01:44:06 the future of our bodies.

01:44:08 I'm going to talk to you about

01:44:10 the future of our bodies.

01:44:12 I'm going to talk to you about

01:44:14 the future of our bodies.

01:44:16 I'm going to talk to you about

01:44:18 the future of our bodies.

01:44:20 I'm going to talk to you about

01:44:22 the future of our bodies.

01:44:24 I'm going to talk to you about

01:44:26 the future of our bodies.

01:44:28 I'm going to talk to you about

01:44:30 the future of our bodies.

01:44:32 I'm going to talk to you about

01:44:34 the future of our bodies.

01:44:36 I'm going to talk to you about

01:44:38 the future of our bodies.

01:44:40 I'm going to talk to you about

01:44:42 the future of our bodies.

01:44:44 I'm going to talk to you about

01:44:46 the future of our bodies.

01:44:48 I'm going to talk to you about

01:44:50 the future of our bodies.

01:44:52 I'm going to talk to you about

01:44:54 the future of our bodies.

01:44:56 I'm going to talk to you about

01:44:58 the future of our bodies.

01:45:00 I'm going to talk to you about

01:45:02 the future of our bodies.

01:45:04 I'm going to talk to you about

01:45:06 the future of our bodies.

01:45:08 I'm going to talk to you about

01:45:10 the future of our bodies.

01:45:12 I'm going to talk to you about

01:45:14 the future of our bodies.

01:45:16 I'm going to talk to you about

01:45:18 the future of our bodies.

01:45:20 I'm going to talk to you about

01:45:22 the future of our bodies.

01:45:24 I'm going to talk to you about

01:45:26 the future of our bodies.

01:45:28 I'm going to talk to you about

01:45:30 the future of our bodies.

01:45:32 I'm going to talk to you about

01:45:34 the future of our bodies.

01:45:36 I'm going to talk to you about

01:45:38 the future of our bodies.

01:45:40 I'm going to talk to you about

01:45:42 the future of our bodies.

01:45:44 I'm going to talk to you about

01:45:46 the future of our bodies.

01:45:48 I'm going to talk to you about

01:45:50 the future of our bodies.

01:45:52 I'm going to talk to you about

01:45:54 the future of our bodies.

01:45:56 I'm going to talk to you about

01:45:58 the future of our bodies.

01:46:00 I'm going to talk to you about

01:46:02 the future of our bodies.

01:46:04 I'm going to talk to you about

01:46:06 the future of our bodies.

01:46:08 I'm going to talk to you about

01:46:10 the future of our bodies.

01:46:12 I'm going to talk to you about

01:46:14 the future of our bodies.

01:46:16 I'm going to talk to you about

01:46:18 the future of our bodies.

01:46:20 I'm going to talk to you about

01:46:22 the future of our bodies.

01:46:24 I'm going to talk to you about

01:46:26 the future of our bodies.

01:46:28 I'm going to talk to you about

01:46:30 the future of our bodies.

01:46:32 I'm going to talk to you about

01:46:34 the future of our bodies.

01:46:36 I'm going to talk to you about

01:46:38 the future of our bodies.

01:46:40 I'm going to talk to you about

01:46:42 the future of our bodies.

01:46:44 I'm going to talk to you about

01:46:46 the future of our bodies.

01:46:48 I'm going to talk to you about

01:46:50 the future of our bodies.

01:46:52 I'm going to talk to you about

01:46:54 the future of our bodies.

01:46:56 I'm going to talk to you about

01:46:58 the future of our bodies.

01:47:00 I'm going to talk to you about

01:47:02 the future of our bodies.

01:47:04 I'm going to talk to you about

01:47:06 the future of our bodies.

01:47:08 I'm going to talk to you about

01:47:10 the future of our bodies.

01:47:12 I'm going to talk to you about

01:47:14 the future of our bodies.

01:47:16 I'm going to talk to you about

01:47:18 the future of our bodies.

01:47:20 I'm going to talk to you about

01:47:22 the future of our bodies.

01:47:24 I'm going to talk to you about

01:47:26 the future of our bodies.

01:47:28 I'm going to talk to you about

01:47:30 the future of our bodies.

01:47:32 I'm going to talk to you about

01:47:34 the future of our bodies.

01:47:36 I'm going to talk to you about

01:47:38 the future of our bodies.

01:47:40 I'm going to talk to you about

01:47:42 the future of our bodies.

01:47:44 I'm going to talk to you about

01:47:46 the future of our bodies.

01:47:48 I'm going to talk to you about

01:47:50 the future of our bodies.

01:47:52 I'm going to talk to you about

01:47:54 the future of our bodies.

01:47:56 I'm going to talk to you about

01:47:58 the future of our bodies.

01:48:00 I'm going to talk to you about

01:48:02 the future of our bodies.

01:48:04 I'm going to talk to you about

01:48:06 the future of our bodies.

01:48:08 I'm going to talk to you about

01:48:10 the future of our bodies.

01:48:12 I'm going to talk to you about

01:48:14 the future of our bodies.

01:48:16 I'm going to talk to you about

01:48:18 the future of our bodies.

01:48:20 I'm going to talk to you about

01:48:22 the future of our bodies.

01:48:24 I'm going to talk to you about

01:48:26 the future of our bodies.

01:48:28 I'm going to talk to you about

01:48:30 the future of our bodies.

01:48:32 I'm going to talk to you about

01:48:34 the future of our bodies.

01:48:36 I'm going to talk to you about

01:48:38 the future of our bodies.

01:48:40 I'm going to talk to you about

01:48:42 the future of our bodies.

01:48:44 I'm going to talk to you about

01:48:46 the future of our bodies.

01:48:48 I'm going to talk to you about

01:48:50 the future of our bodies.

01:48:52 I'm going to talk to you about

01:48:54 the future of our bodies.

01:48:56 I'm going to talk to you about

01:48:58 the future of our bodies.

01:49:00 I'm going to talk to you about

01:49:02 the future of our bodies.

01:49:04 I'm going to talk to you about

01:49:06 the future of our bodies.

01:49:08 I'm going to talk to you about

01:49:10 the future of our bodies.

01:49:12 I'm going to talk to you about

01:49:14 the future of our bodies.

01:49:16 I'm going to talk to you about

01:49:18 the future of our bodies.

01:49:20 I'm going to talk to you about

01:49:22 the future of our bodies.

01:49:24 I'm going to talk to you about

01:49:26 the future of our bodies.

01:49:28 I'm going to talk to you about

01:49:30 the future of our bodies.

01:49:32 I'm going to talk to you about

01:49:34 the future of our bodies.

01:49:36 I'm going to talk to you about

01:49:38 the future of our bodies.

01:49:40 I'm going to talk to you about

01:49:42 the future of our bodies.

01:49:44 I'm going to talk to you about

01:49:46 the future of our bodies.

01:49:48 I'm going to talk to you about

01:49:50 the future of our bodies.

01:49:52 I'm going to talk to you about

01:49:54 the future of our bodies.

01:49:56 I'm going to talk to you about

01:49:58 the future of our bodies.

01:50:00 I'm going to talk to you about

01:50:02 the future of our bodies.

01:50:04 I'm going to talk to you about

01:50:06 the future of our bodies.

01:50:08 I'm going to talk to you about

01:50:10 the future of our bodies.

01:50:12 I'm going to talk to you about

01:50:14 the future of our bodies.

01:50:16 I'm going to talk to you about

01:50:18 the future of our bodies.

01:50:20 I'm going to talk to you about

01:50:22 the future of our bodies.

01:50:24 I'm going to talk to you about

01:50:26 the future of our bodies.

01:50:28 I'm going to talk to you about

01:50:30 the future of our bodies.

01:50:32 I'm going to talk to you about

01:50:34 the future of our bodies.

01:50:36 I'm going to talk to you about

01:50:38 the future of our bodies.

01:50:40 I'm going to talk to you about

01:50:42 the future of our bodies.

01:50:44 I'm going to talk to you about

01:50:46 the future of our bodies.

01:50:48 I'm going to talk to you about

01:50:50 the future of our bodies.

01:50:52 I'm going to talk to you about

01:50:54 the future of our bodies.

01:50:56 I'm going to talk to you about

01:50:58 the future of our bodies.

01:51:00 I'm going to talk to you about

01:51:02 the future of our bodies.

01:51:04 I'm going to talk to you about

01:51:06 the future of our bodies.

01:51:08 I'm going to talk to you about

01:51:10 the future of our bodies.

01:51:12 I'm going to talk to you about

01:51:14 the future of our bodies.

01:51:16 I'm going to talk to you about

01:51:18 the future of our bodies.

01:51:20 I'm going to talk to you about

01:51:22 the future of our bodies.

01:51:24 I'm going to talk to you about

01:51:26 the future of our bodies.

01:51:28 I'm going to talk to you about

01:51:30 the future of our bodies.

01:51:32 I'm going to talk to you about

01:51:34 the future of our bodies.

01:51:36 I'm going to talk to you about

01:51:38 the future of our bodies.

01:51:40 I'm going to talk to you about

01:51:42 the future of our bodies.

01:51:44 I'm going to talk to you about

01:51:46 the future of our bodies.

01:51:48 I'm going to talk to you about

01:51:50 the future of our bodies.

01:51:52 I'm going to talk to you about

01:51:54 the future of our bodies.

01:51:56 I'm going to talk to you about

01:51:58 the future of our bodies.

01:52:00 I'm going to talk to you about

01:52:02 the future of our bodies.

01:52:04 I'm going to talk to you about

01:52:06 the future of our bodies.

01:52:08 I'm going to talk to you about

01:52:10 the future of our bodies.

01:52:12 I'm going to talk to you about

01:52:14 the future of our bodies.

01:52:16 I'm going to talk to you about

01:52:18 the future of our bodies.

01:52:20 I'm going to talk to you about

01:52:22 the future of our bodies.

01:52:24 I'm going to talk to you about

01:52:26 the future of our bodies.

01:52:28 I'm going to talk to you about

01:52:30 the future of our bodies.

01:52:32 I'm going to talk to you about

01:52:34 the future of our bodies.

01:52:36 I'm going to talk to you about

01:52:38 the future of our bodies.

01:52:40 I'm going to talk to you about

01:52:42 the future of our bodies.

01:52:44 I'm going to talk to you about

01:52:46 the future of our bodies.

01:52:48 I'm going to talk to you about

01:52:50 the future of our bodies.

01:52:52 I'm going to talk to you about

01:52:54 the future of our bodies.

01:52:56 I'm going to talk to you about

01:52:58 the future of our bodies.

01:53:00 I'm going to talk to you about

01:53:02 the future of our bodies.

01:53:04 I'm going to talk to you about

01:53:06 the future of our bodies.

01:53:08 I'm going to talk to you about

01:53:10 the future of our bodies.

01:53:12 I'm going to talk to you about

01:53:14 the future of our bodies.

01:53:16 I'm going to talk to you about

01:53:18 the future of our bodies.

01:53:20 I'm going to talk to you about

01:53:22 the future of our bodies.

01:53:24 I'm going to talk to you about

01:53:26 the future of our bodies.

01:53:28 I'm going to talk to you about

01:53:30 the future of our bodies.

01:53:32 I'm going to talk to you about

01:53:34 the future of our bodies.

01:53:36 I'm going to talk to you about

01:53:38 the future of our bodies.

01:53:40 I'm going to talk to you about

01:53:42 the future of our bodies.

01:53:44 I'm going to talk to you about

01:53:46 the future of our bodies.

01:53:48 I'm going to talk to you about

01:53:50 the future of our bodies.

01:53:52 I'm going to talk to you about

01:53:54 the future of our bodies.

01:53:56 I'm going to talk to you about

01:53:58 the future of our bodies.

01:54:00 I'm going to talk to you about

01:54:02 the future of our bodies.

01:54:04 I'm going to talk to you about

01:54:06 the future of our bodies.

01:54:08 I'm going to talk to you about

01:54:10 the future of our bodies.

01:54:12 I'm going to talk to you about

01:54:14 the future of our bodies.

01:54:16 I'm going to talk to you about

01:54:18 the future of our bodies.

01:54:20 I'm going to talk to you about

01:54:22 the future of our bodies.

01:54:24 I'm going to talk to you about

01:54:26 the future of our bodies.

01:54:28 I'm going to talk to you about

01:54:30 the future of our bodies.

01:54:32 I'm going to talk to you about

01:54:34 the future of our bodies.

01:54:36 I'm going to talk to you about

01:54:38 the future of our bodies.

01:54:40 I'm going to talk to you about

01:54:42 the future of our bodies.

01:54:44 I'm going to talk to you about

01:54:46 the future of our bodies.

01:54:48 I'm going to talk to you about

01:54:50 the future of our bodies.

01:54:52 I'm going to talk to you about

01:54:54 the future of our bodies.

01:54:56 I'm going to talk to you about

01:54:58 the future of our bodies.

01:55:00 I'm going to talk to you about

01:55:02 the future of our bodies.

01:55:04 I'm going to talk to you about

01:55:06 the future of our bodies.

01:55:08 I'm going to talk to you about

01:55:10 the future of our bodies.

01:55:12 I'm going to talk to you about

01:55:14 the future of our bodies.

01:55:16 I'm going to talk to you about

01:55:18 the future of our bodies.

01:55:20 I'm going to talk to you about

01:55:22 the future of our bodies.

01:55:24 I'm going to talk to you about

01:55:26 the future of our bodies.

01:55:28 I'm going to talk to you about

01:55:30 the future of our bodies.

01:55:32 I'm going to talk to you about

01:55:34 the future of our bodies.

01:55:36 I'm going to talk to you about

01:55:38 the future of our bodies.

01:55:40 I'm going to talk to you about

01:55:42 the future of our bodies.

01:55:44 I'm going to talk to you about

01:55:46 the future of our bodies.

01:55:48 I'm going to talk to you about

01:55:50 the future of our bodies.

01:55:52 I'm going to talk to you about

01:55:54 the future of our bodies.

01:55:56 I'm going to talk to you about

01:55:58 the future of our bodies.

01:56:00 I'm going to talk to you about

01:56:02 the future of our bodies.

01:56:04 I'm going to talk to you about

01:56:06 the future of our bodies.

01:56:08 I'm going to talk to you about

01:56:10 the future of our bodies.

01:56:12 I'm going to talk to you about

01:56:14 the future of our bodies.

01:56:16 I'm going to talk to you about

01:56:18 the future of our bodies.

01:56:20 I'm going to talk to you about

01:56:22 the future of our bodies.

01:56:24 I'm going to talk to you about

01:56:26 the future of our bodies.

01:56:28 I'm going to talk to you about

01:56:30 the future of our bodies.

01:56:32 I'm going to talk to you about

01:56:34 the future of our bodies.

01:56:36 I'm going to talk to you about

01:56:38 the future of our bodies.

01:56:40 I'm going to talk to you about

01:56:42 the future of our bodies.

01:56:44 The feet become wider and longer.

01:56:47 [MUSIC PLAYING]

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