00:00 Look at this. There are people who can bend their little finger without bending their ring finger.
00:05 But most find it difficult, or even impossible to accomplish.
00:10 When they move their middle finger or their little finger, they tend to slightly bend their ring finger as well.
00:15 Yes, for me too it is the case.
00:18 The luxation of the eye is an extremely rare condition that allows some people to bring their eyes out of their orbits.
00:25 Unfortunately, this ability has disadvantages.
00:29 It can lead to many eye problems.
00:32 Some indigenous peoples, like the Tibetans, can survive at altitudes as high as those of Mount Everest.
00:39 This rare ability is very likely to have appeared after years of evolution.
00:44 The ancestors of the modern Tibetans lived in high altitudes for thousands of years.
00:49 And their red blood cells have adapted as a result,
00:52 making it possible to survive with dangerously low oxygen levels.
00:56 The Bajau are nomads of the sea living in Southeast Asia.
01:00 These individuals have developed an extra large rat, serving as a storage of blood cells rich in oxygen.
01:06 Thanks to this, they can easily spend 5 to 10 minutes fishing underwater without going back to the surface to breathe,
01:13 if only once.
01:15 About 14% of the population is devoid of long-palm muscle.
01:20 Poor old man.
01:21 It is actually a rudimentary part of the body, and the need for it has disappeared during our evolutionary process.
01:28 So, if you do not have this muscle, do not worry.
01:32 Its absence does not affect the functioning of your forearm in any way.
01:36 About 5 to 37% of people have been deprived of wisdom teeth since their birth.
01:42 These teeth are no longer really necessary today.
01:45 They were important for our ancestors because they helped them to chew hard foods like nuts, roots and raw meat.
01:53 And the caramels, soft with the salt of Gehrend.
01:56 No, I'm making it up.
01:58 But as most of the food we eat today is transformed, wisdom teeth are no longer just a simple atavism.
02:05 Most people have only one spiral of hair implantation, which goes in the direction of needles and a watch.
02:11 But 5 people out of 100 have a double crown.
02:14 And if the two spirals are directed in the opposite direction of the needles and a watch, it makes the person even more unique.
02:21 Some scientists think there is a genetic link between the direction of this spiral and our right hand.
02:27 A little more than 8% of right-handed people have a spiral going in the opposite direction of the needles and a watch.
02:34 But in left-handed people, this number goes up to 45%.
02:38 The brain of the man ages faster than that of the woman.
02:42 As men get older, they start to complain more and more often of memory problems and lack of concentration.
02:49 At the same time, women do not have such serious problems with their memory, but they feel more often depressed.
02:55 Which one would you choose?
02:57 When a person lies, his own nose betrays him.
03:00 Psychologists at the University of Grenade discovered that when a person told a lie,
03:05 the temperature around his nose and in the inner corners of his eyes increased.
03:10 This phenomenon was named, surprise surprise, the Pinocchio effect.
03:15 The Japanese have specific bacteria, the plebeian bacteroides, in their intestines.
03:21 These bacteria help them digest sushi.
03:23 The Japanese have been eating raw algae for centuries.
03:27 The microorganisms present on the surface of these algae have entered their bodies and have actively developed.
03:33 Today, these bacteria help the Japanese to digest raw food and prevent various problems related to their diet.
03:41 Humans would have as many hairs on their bodies as chimpanzees.
03:44 The number of hairs of an individual and a chimpanzee is approximately the same.
03:49 The only difference is that human body hair is essentially useless and so thin that it is almost impossible to distinguish.
03:56 Humans do not have more genes than other species.
03:59 In fact, people have even less genes than a fly.
04:03 Tomatoes also have a lot more genes than you and me.
04:06 But we are creatures so complex.
04:08 Well, recently, scientists have concluded that the number of genes contained in a genome
04:13 was not closely related to the complexity of a living being.
04:17 Let's take a break to breathe a little.
04:20 And speaking of that, your left lung is made up of two lobes,
04:23 while your right lung is divided into three parts.
04:26 In addition, the left lung is a little smaller, because it must leave room for your heart.
04:32 Your lungs also contain about 2,400 km of respiratory vein.
04:37 It is more than half the distance between New York and Los Angeles.
04:41 There are also more than 300 million alveoli in your lungs, which are small air bags in the form of balloons.
04:47 People have five senses, among the most obvious.
04:51 Sight, smell, touch, hearing and taste.
04:55 But that's not all.
04:57 What about thermosensation, the sense of heat?
05:00 Or nociception, the perception of pain?
05:03 Or even the consciousness of one's own body, proprioception?
05:08 To understand what it is about, close your eyes and touch your nose.
05:12 Did you succeed?
05:14 It's thanks to proprioception.
05:17 This list can be much longer.
05:19 Some experts say that people have 21 to 53 senses.
05:24 Your fingers become all frizzy after spending too much time in the water.
05:28 The frizzy fingers are caused by the shrinking of your blood vessels.
05:32 When you stay in the water for a long time, your nervous system makes your capillaries retract.
05:37 Your body removes the blood from this area, and this loss of blood makes your vessels narrower.
05:43 The skin begins to fold back around them, forming these funny wrinkles.
05:47 Scientists think that this process would help us to have a better grip when our hands and feet are wet.
05:54 There are three kinds of cones in the eyes of an ordinary person.
05:57 These cones help to recognize colors in blue, red and green spectra.
06:03 Thanks to them, most people can distinguish about a million different shades.
06:09 But those who are gifted with tetachromatism have four cones in their eyes.
06:13 This feature allows them to see up to 100 million different shades.
06:17 This anomaly of vision is extremely rare, and it is much more common in women than in men.
06:23 Interestingly, most people with tetrachromatism do not even realize that they see a brighter world than others.
06:31 Not all people have round pupils.
06:34 Two out of 10,000 people have unusual-shaped pupils.
06:38 Most often, they have a form of closure.
06:41 This eye disorder is called colobom.
06:44 It should be noted that some people with this condition have no vision problems.
06:50 Only 3 to 22% of people in the world have a morton's toe or Greek foot.
06:56 It is a structure of the foot where the second toe is longer than the first.
07:00 Michelangelo's David and the Statue of Liberty both have this unusual body feature.
07:07 For my part, I prefer to have them in the form of a fan.
07:10 In some people, saliva accumulates in a gland under their tongue.
07:15 It can then be propelled by a jet when the person presses on this gland.
07:19 If the mouth is open at that moment, the jet can reach several meters.
07:24 This process, the "glavitur" effect, can occur spontaneously.
07:29 A person accidentally presses his tongue against the gland by eating,
07:33 drooling, speaking or brushing his teeth. And that's it.
07:37 Up to 35% of people could do this, but only 1% can do it on command.
07:43 I had a friend at the university who did this. Yes, it was weird.
07:48 About 18 to 35% of people have an interesting reaction to sunlight.
07:53 They "ethernuate". This phenomenon has its own name.
07:57 The photosternitatory reflex. In Greek, it means "sunlight ethernation".
08:03 Just like salamanders make their tails grow back, humans could be able to regenerate their cartilage.
08:09 It is this rubbery matter around your joints.
08:13 Recently, scientists have discovered that the cartilage could be able to repair itself.
08:19 In the most effective way, on the ankle, not very well on the knees, and less effectively on the hip.
08:24 The human brain is composed of 73% water, just like your heart.
08:29 That's why if your brain loses only 2% of water, you start to feel exhausted.
08:35 It also affects your memory, reduces your attention capacity and has a negative impact on your mood.
08:42 So, drink a shot.
08:44 Your brain constantly processes tons of visual information, about 600 million bits per minute.
08:51 Everything starts when the light crosses the cornea.
08:54 The protective outer layer is transparent to your eye.
08:58 Then, the light turns into electrical signals.
09:02 They move towards your brain and interpret them in images you see.
09:06 This complex process takes place in a few milliseconds.
09:10 People who live up to 110 years and older, known as "super centenarians", could have a secret.
09:17 Researchers have discovered that their immune cells, called the auxiliary T lymphocyte,
09:24 could change and adapt to the last stage of aging.
09:28 These cells are likely to protect them from viruses and other health problems.
09:33 We have become multitasking workers thanks to technology.
09:37 Or rather, it seems to be the case.
09:40 The human brain cannot focus on two things at once.
09:44 What it can do is to quickly switch from one task to another.
09:48 But this reduces your attention span and short-term memory loss, as well as your learning capacity.
09:54 So, give me this phone back.
09:57 (upbeat music)
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