- 2 hours ago
Humans have been fascinated by many things like space, natural phenomena or the depth of the ocean. But one mysterious object is situated right in front of our eyes when we look in the mirror. It's a human body. That's right, your body is a beautiful, wacky, and mysterious machine. Here’s the thing: we live with it, so sometimes it’s easy to forget how amazing things work in our bodies!
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00:00You can't recall a memory all by itself.
00:03When you're trying to think of one detail, like the color of the t-shirt your friend
00:07was wearing the other week, you'll remember some other details too.
00:11For example, the place where you saw him, things you were talking about.
00:15The hippocampus is the part of your brain that stores memories.
00:19It usually packs them together, including multiple small details.
00:24On average, taste buds last 10 days, clusters of sensory cells in your tongue.
00:30The buds that are closer to the surface are more short-lived.
00:33That's the reason you don't have to wait for too long to be able to taste again after burning your
00:38tongue.
00:40One theory says déjà vu is some sort of a brain processing lag.
00:44Scientists think it might happen when your brain is transferring information from one side to the other,
00:49and there's a split-second delay in that process.
00:52That means that your brain gets the same information twice and processes it as the event that happened before.
01:00Only 30% of people can flare their nostrils, and one-third can bend their thumb backward.
01:07Some people can produce a roaring noise in their heads.
01:10All they have to do is tense their ears or jaws.
01:14There's a small muscle in the ear.
01:16It dampens loud sounds, like when you're chewing.
01:19But some people can flex that muscle, and that creates an audible rumble.
01:24Your fingertips are sensitive, but hundreds of times less so than your lips.
01:30You inhale lots of different types of debris, including 700,000 of your own skin flakes.
01:36And that's only in a day.
01:39A hypnic jerk is a twitch you can experience when falling asleep.
01:44It's an abrupt muscle movement that comes during the non-REM sleep phase.
01:48It can create an illusion of falling.
01:51One of the theories is that, when you're dozing off, your brain sees the relaxing of your muscles as a
01:57sign you're in trouble and really falling.
01:59So it sends signals to the muscles to protect you by tensing up.
02:05Synesthesia is a special and rare ability where people can taste music or hear colors.
02:10Only one in every 2,000 people has it.
02:14For some people, cilantro may taste similar to soap because the plant contains a chemical used in soap making.
02:21But only 4-14% of the world's population have special genes that can detect it.
02:2818% of people can move both ears at the same time, while 22% can move one ear at
02:34once.
02:34People who do it use weak vestigial muscles we got from the ancestor humans, who had this in common with
02:40cats.
02:43Bruises change their color over time.
02:45A bruise appears because there's bleeding under the skin.
02:47Tiny blood vessels get crushed, and some blood gets trapped in there.
02:52In the beginning, a bruise is red because the blood is rich in oxygen.
02:56But then, it turns purple, green, yellow, or even gray when the levels of oxygen drop.
03:03Sweat doesn't smell itself.
03:05The unpleasant odor is caused by bacteria on your skin.
03:08When sweat comes out of the pores on your body, the bacteria breaks it down into acids.
03:13What most deodorants actually do is get rid of the bacteria on your skin.
03:18People used to dream in black and white much more than today.
03:22That's because they watched black and white TV.
03:25Blue cheese is another thing that affects your dreams and makes them more vivid.
03:31Eggshells might be used for growing new human bones.
03:34Chicken eggshells contain calcium carbonate, which is something you also have in your bones.
03:40The food on the plane is likely to taste different than on the ground.
03:44That's because you lose up to 30% of your tastebud sensitivity due to the dryness and pressure in the
03:49cabin.
03:50It's especially true about salty and sweet foods.
03:54Your nostrils don't work with the same efficiency all the time.
03:58When you breathe, one nostril does most of the work, and they switch every couple of hours.
04:03You wouldn't be able to taste food without saliva.
04:06Your taste buds have chemo receptors that recognize different flavors,
04:10but they need some liquid for those flavors to bind into their molecules.
04:14Also, you can't taste things saliva doesn't dissolve.
04:18The brain can't actually feel pain.
04:21It does have a pain center, but it doesn't have pain receptors itself.
04:26When your head hurts, you can feel it because of the nerves, tissues, and blood vessels around your brain.
04:32A single human hair can support 3.5 ounces of weight.
04:36That's how much two candy bars weigh.
04:40Toenails grow almost four times more slowly than fingernails that get more exposure,
04:44and are used more frequently.
04:47There must be at least some photos where you have red eyes.
04:50When the camera's flash goes off, your eyes aren't prepared for such an influx of light.
04:55Your pupils remain dilated, which is why the light gets reflected off the red blood vessels of the choroid.
05:00This is a layer of tissue at the back of your eye that nourishes your retina.
05:05The right lung is bigger than the left one because your body needs to make some room for the heart.
05:11Your teeth are the only part of your body that can heal itself.
05:15The masseter is the strongest muscle you have, based on its weight.
05:19Together with the rest of the raw muscles, it can close your teeth with a force of 200 pounds on
05:24the molars,
05:25and 55 pounds on the incisors.
05:30Onions produce a special chemical irritant.
05:33It stimulates special glands in your eyes, causing them to release tears.
05:38Your nose can memorize up to 50,000 different scents and detect more than one trillion of odors.
05:45We all have our unique smell, except for identical twins.
05:49This smell is partly determined by genetics, but it also depends on your diet, hygiene, and the environment.
05:56Eating snow is not the best way to stay hydrated.
05:59Your body needs too much energy to turn it into water.
06:02Snow can provide a bit of hydration, but it'll also lower the temperature of your body,
06:07which isn't the best scenario if you're trying to survive harsh winter conditions.
06:12You burn somewhere between 100 and 200 calories per hour while standing.
06:18Sitting burns 60 to 130 calories, depending on your height, weight, gender, and age.
06:26Brain freeze is an annoying ice cream headache.
06:29That's how your brain tells you to slow down and maybe stop eating something that's so cold.
06:34The main purpose of eyelashes is to shield your eyes and protect them from sand, moisture, dust, and debris in
06:40the air.
06:40Your eyelashes sense when something comes up too close to your eyes, like an insect flying toward you, and trigger
06:47your blink reflex.
06:49Blinking also helps when you need to flush out some tiny particles or debris stuck in your punk dot.
06:54Those are small openings you have in your eyelids. That's where the tears get pumped out.
07:00Your eyebrows stop sweat from running directly into your eyes.
07:04Your skin there and the shape of your bones also work together to direct the sweat toward the sides of
07:09your face.
07:10We're not the fastest, strongest, or biggest in the animal kingdom, but we're the best at long distance running.
07:17That's because we have long legs, and our bodies can lose excess heat through sweating.
07:21Even long ago, our ancestors hunted animals by chasing them for long periods of time.
07:27Eventually, it wore smaller creatures out.
07:30Five basic senses are taste, touch, sight, sound, and smell, but people have more senses than that.
07:39Proprioception is when your body is aware of its parts and their position, even if you don't see them.
07:44Like if your arm is behind your back, you know it's there.
07:47If you were an octopus, you wouldn't know it, because these creatures don't know their arms exist if they can't
07:52see them.
07:54Thermoception is your ability to sense temperature.
07:57Equilibrioception is a sense of balance.
07:59You also have nociception, which means you can feel pain.
08:03Then there's chronoception.
08:05That's how you can sense time passing by.
08:08There are even more senses found in the animal kingdom.
08:11Electro-reception and magneto-reception, but people don't have those.
08:17You can't see your taste buds.
08:19Those little bumps on the tongue are lingual papillae.
08:21There are four kinds of them.
08:25Circumvalate, foliate, fungiform, filiform.
08:29They are all covered with taste buds, except for the last one, filiform.
08:33This one is responsible for the sense of touch in your tongue.
08:37Your pinky holds 50% of the total strength in your hand.
08:42Your liver is a very important organ that works a lot and is responsible for 500 individual functions.
08:49Up to 10% of it is made of fat.
08:52The liver can regenerate.
08:55You can burn calories when you take a hot bath.
08:58As many as you would if you took a half-hour walk.
09:01People mostly need 7 minutes to fall asleep.
09:04This time gets shorter if you've just had a large tasty meal.
09:09On average, the heart is as big as your fist.
09:12It beats 115,000 times and pumps around 2,000 gallons of blood a day.
09:18Now what do you call a person who can write with either hand equally well?
09:22How can you reach with your tongue into your nose from inside?
09:26And why would you even want to do that?
09:28See further if you have a real superpower.
09:32About a third of all people can raise one eyebrow, left or right.
09:35It's a great way to send a playful signal to someone while telling a joke.
09:39But the ability to raise both eyebrows separately is much rarer.
09:43If you're not among them, that's because you cannot yet control and move the corresponding muscles.
09:48But this skill can be developed.
09:50Stand in front of a mirror, hold one eyebrow with your hand and lift the other one up and down.
09:55And then do the same with the other eyebrow.
09:58This will help you learn moving them separately.
10:00Can you sit down on the floor and get back without the help of your hands or knees?
10:04This simple challenge is called the sitting rising test.
10:08Clever name.
10:09Although scientists argue whether this test is trustworthy in telling anything about your health,
10:14you can still use it to check whether your muscles and heart are strong enough.
10:18If you're unable to get off the floor without the support of your hands or knees,
10:22maybe it's time to return to the gym.
10:24Now stretch out your hand and place a ring on the crook of your elbow.
10:28Then rotate your palm.
10:30If the ring didn't fall, you're a rare person.
10:33Some say only 2% of people can do that, but that's arguable.
10:37If you can lick your elbow easily or touch your thumb to your forearm, congratulations,
10:42you're among the minority of people.
10:44But some people bring flexibility to the next level.
10:47This condition is called hypermobility.
10:50It allows rare individuals to twist their bodies into weird positions just like a snake,
10:55putting their head between their feet, doing a back bridge, and all sorts of splits.
11:00But in some cases, hypermobility can increase sensitivity.
11:04Because such people have a larger medulla, this brain area is responsible for processing emotions.
11:11Now, 90% of people are right-handed and only 10% are left-handed.
11:15Yes, that adds up.
11:16But there's also a very small percentage of those who can use both hands equally well,
11:21including writing, drawing, and doing any tasks.
11:25Naturally, ambidextrous people account for only 1% of the entire population,
11:29which is about 70 million people.
11:31If you want to check whether you're one of them,
11:34try to write the same phrase with both hands,
11:36or draw a circle first with your right and then with your left hand.
11:40If there's no difference, congrats!
11:42By the way, these exercises are very good for balancing the hemispheres of the brain,
11:47regardless of which hand is your working one.
11:50Mirror writing is another good way to awaken your neurons.
11:53Wake up, wake up!
11:55Leonardo da Vinci used to write down his thoughts in a journal from right to left.
11:59The actual purpose of his mirror writings is still unknown,
12:02but some people suggest that he just tried to prevent smudging the ink because he was left-handed.
12:08Creating a mirrored text is not an easy task for most people.
12:12Most people depend on weather forecasts and have to adjust their outfits
12:15depending on the season to avoid catching a cold.
12:18But not everyone!
12:20Lucky ones have learned to keep their bodies warm in any frost.
12:23These fearless heroes can walk in the cold wearing only swimming trunks and feel cozy.
12:28They can stand in the snow barefoot and even swim in a river or an ice hole.
12:33Usually, this talent doesn't come naturally.
12:35People temper their bodies for years until they get used to withstand extreme cold.
12:40Of course, they don't do it just to look cool or feel cool.
12:47Health benefits from this procedure include better blood circulation, increased concentration,
12:52and an overall sense of well-being.
12:54And how many seconds can you stand barefoot in the snow?
12:58Not many!
12:59Okay, stretch out your palms in front of you. Squeeze together all of your fingers except your thumb.
13:05Now spread the index and middle fingers and a ring finger with the little finger in different directions.
13:10Success?
13:11If so, you'd probably make a wonderful musician because the nerves in your palms are well-developed.
13:18Do you feel ticklish when you tickle yourself?
13:20Now, normally you wouldn't unless someone else tickles you.
13:23It happens because the cerebellum area of the brain, which monitors movements,
13:28predicts the sensations caused by your own movements.
13:31Then it sends a signal to other parts of the nervous system to cancel these sensations.
13:35But some rare individuals can actually feel ticklish on their own.
13:39If you're not among them, touching a new texture that the brain doesn't yet recognize,
13:44or using a scalp massager can help to excite your nerves and bring relaxation.
13:49Okay, grab a sheet of paper and something to write with and sit on a chair.
13:54Stretch one leg and rotate your foot clockwise.
13:57Try to draw the number 6 on the paper or in the ear while still rotating your foot.
14:02This task is so much struggle because the left area of your brain can't handle two
14:07opposite rotations at the same time.
14:10That's why the brain tries to bring all movements in the same direction.
14:13Only a few people can manage it from the first attempt.
14:16You can also try to write other numbers and watch the funny results.
14:20Seems like the foot has no problem only with zero.
14:23If you want to check out the work of your vestibular system, try this simple trick.
14:28Stand on one foot and close your eyes.
14:31Most people lose balance at least during the first attempt.
14:33Your vestibular system includes many organs and systems throughout the body.
14:38Together, they allow your body to stay in balance in different positions.
14:42This system includes the inner ear and vision,
14:45which is why keeping balance is much easier in silence while your eyes are open.
14:50Every day, people use their tongue to recognize different tastes and communicate with each other.
14:55But it's also a great tool for a bunch of tricks.
14:58Around 10% of people can touch the tip of their nose with their tongue.
15:02The current title of the world's longest tongue belongs to Nick Stowbell from the USA.
15:08His tongue measures 3.97 inches, according to Guinness World Records.
15:12There's also another contender whose name is in the Indian book of records
15:16for the tongue measuring a whopping 10.8 inches.
15:20Wow! Imagine what he can do to an ice cream cone.
15:23But the average adult male tongue is only about 3.3 inches long,
15:27and the average female tongue is 3.1 inches.
15:30That's why most people can't perform the nose trick that easily.
15:34Okay, tying a cherry stem in a knot is a popular party challenge,
15:38but only a few people can do it right and quickly.
15:41Al Glynaetsky set the world Guinness record in June 2014,
15:45when he made 14 cherry stem knots in one minute using only his tongue.
15:50Wow!
15:51If you want to try to beat his record,
15:53practice with patience and pick longer stems around an inch and a half long.
15:57Plenty of tutorials on this topic at your service.
16:00Stand in front of a mirror, open your mouth, and try to roll the sides of your tongue up towards
16:05each
16:06other to make a U-shape. About 65 to 81 percent of people are natural tongue rollers, and the majority
16:12are women. Some believe it's a genetic capability, but recent studies show that people can actually
16:17develop this skill by practicing. Ketrimudra is a term from yoga that means curling the tip of your tongue
16:24back into the mouth. Ideally, it should reach above the soft palate and rest in the beginning of the
16:30nasal cavity. This asana helps refresh the mind and body and overcome thirst, hunger, and anxiety.
16:37Some say it also helps to become a professional lucid dreamer if you acquire a habit to fall
16:43asleep with Ketrimudra every night. But most yoga beginners spend months and even years to reach
16:49into the nasal cavity. And if you can do it right away, you're the lucky one.
16:54Can you wiggle your ears intentionally? Congratulations! Around 22 percent of people
16:59on the Earth are capable of wiggling one ear. As for moving both ears at once, only 18 percent can
17:06do
17:06that. Ear wiggling used to be a common thing for our distant ancestors. Scientists believed they could
17:11perform a variety of movements with their ears. The group of muscles responsible for wiggling is called
17:17the auriculars, and we mostly don't need it today. But some people claim that everyone can learn to
17:23move their ears. It only takes time and practice. Unfortunately, we still cannot acquire this classy
17:29habit of twitching an ear toward a sound source as dogs and c- Yep, your brain will grow by
17:34roughly 2 percent
17:35if you venture into space. Under normal gravity, it is thought that fluid in the brain naturally moves
17:42downwards when we stand upright. But there is evidence that lack of gravity prevents this,
17:48which is why fluid accumulates in the brain and skull. While a bunch of flowers may be fragrant for
17:54you, there are people with cacosmia who would beg to differ. They perceive all the smells out there as
18:00something odorous. Well, that stinks! Speaking of which, out of all the senses we have,
18:06smell is the most acute one. We remember 65 percent of smells after a year, but only 50 percent of
18:14what
18:14we've seen over the last three weeks. We also get a new nose every 28 days, because the nose cells
18:21are
18:21renewed every four weeks. We don't smell when we sleep. Well, of course, unless you haven't bathed in
18:28a while. Your sense of smell goes to sleep when you do, which is why it's almost impossible to notice
18:34a gas leak at night. While sleeping, we rely only on sound, because the sleep can be disrupted by noise.
18:41Almost half of your taste buds will have gone away by the time you turn 60. So maybe you will
18:48finally
18:48start eating those broccoli! Your sense of smell gets less acute as you get older as well.
18:54As for taste again, we mostly rely on our smell, since it helps us perceive up to 95 percent of
19:01the
19:01flavor. Without the sense of smell, it'd be hard to tell an apple from a turnip.
19:06Now, when you cough, you release the air at about 60 miles per hour, so mind the speed limit.
19:13Hiccups is a two-step process. First, you draw in a lot of air because of a muscle spasm, and
19:19then
19:19bang! The airways are closed, the air is blocked, and the famous sound goes outside.
19:26We need ears not only for hearing, but for balance, too. Our vestibular system occupies the inner ear.
19:34Canals in your inner ear contain fluid and tiny sensors helping you keep the balance.
19:39By the way, ears have bones. These are also the only bones that never grow. We can hear thanks to
19:46these little guys, since they transmit sound vibrations. Doctors call them oscular chain,
19:52and it's made up of malleus, incus, and stapes, nicknamed hammer, anvil, and stirrup,
19:58which are integral parts of the middle ear. Our ears keep growing throughout our lives.
20:04They sweat, too, and earwax is actually a kind of sweat they produce. Oh, by the way,
20:10the nose never stops growing either. Perhaps from all the lies.
20:15Your heart is the only muscle that never gets tired. The aorta is massive. Its diameter is almost
20:22as large as a hose in your garden. All the bones in our body are connected to each other,
20:29except for the hyoid, which doesn't articulate with the other bones. This bone serves as support
20:34to your tongue, and it's one of the rarest bones to break. If you have red eyes in a photo,
20:40blame it on bouncing light. The flash jumps off the capillaries in your retina, creating that effect.
20:47As for eyes, the coolest camera so far has 200 megapixels. The human eye has 576. That's why
20:55sunsets are so much better in real life than in photos. A roller coaster actually tosses your organs
21:02around. When you feel like your stomach's falling down, it's really flipping inside your body.
21:07Lips are much more sensitive than fingers, having around a million nerve endings. They are 100 times
21:14as sensitive as the tips of the fingers. Grooves and furrows make our lip print unique,
21:20just like fingerprints are. They also remain unchanged throughout our life. Oh,
21:25the tongue print is unique too, by the way. Even though all the people on Earth have an
21:30absolutely unique smell. Identical twins smell exactly the same. It must be because they have
21:36identical genes. Usually, we shed about 50 to 150 hairs a day. An average lifespan for a hair is 5
21:45years,
21:46and as soon as an old hair says goodbye to your scalp, a new one starts growing immediately.
21:52In your body, you carry enough bacteria to fill a can. Bacteria makes about 3 to 5 pounds of your
21:59weight,
21:59representing 2% of your total weight. Still, most of them are the waste that our body has.
22:06A human being has about 20,000 to 25,000 genes. Seems impressive, right? Well, cornflakes have more
22:14genes than we do. Luckily, it's about sophistication, not the quantity. Anyway, cornflakes 1, human 0.
22:22We consist of many chemical elements, including iron. The iron in our bodies is enough to produce
22:283 nails, each 1 inch long. The carbon that we have can be used for 900 pencils. Our feathers can
22:36be used to
22:37make quill pens. Wait, that's birds. Never mind.
22:41Our liver has a superpower of regenerating if part of it was removed. It can grow back to the size
22:47that
22:47your body needs. Fat helps our bodies consume vitamins. Such vitamins as A, D, K, and E can be
22:55properly absorbed only when fat dissolve. Our bodies have enough fat to produce 7 bars of soap. Don't try
23:03this at home. When we're awake, our brain may produce enough energy to turn an electric bulb on.
23:10It has 10 watts of power. What's that about? Our belly buttons have an entire animal
23:17encyclopedia in them, with a range of about 70 different bacteria. Some of them can be also found
23:23in the soil of Japan, and even in polar ice caps. Our bodies actually glow. Anyway, we can't see that
23:32with an unaided eye, because the light we emit is 1,000 times less intense than the minimum level we
23:38can perceive. Speaking of which, carmine used blushes and lipsticks is red dye made up of ground-up beetles.
23:48Saliva helps to taste food. Our taste buds are ready to perceive it only when it's dissolved by saliva.
23:56An eyelash is here to stay for 150 days only. The world eyelash record was about 3 inches long.
24:04They're also home for tiny mites. We blink about 4,200,000 times a year, at least once every 8
24:12seconds.
24:13Could be cool if we were given a cent every time we blinked. We could make more than $100 daily.
24:19It may sound crazy, but our bones are stronger than lots of building materials. A cubic inch of human
24:26bone can bear about 19,000 pounds, making it 4 times stronger than concrete.
24:32The only thing that makes our blood type different is sugar. A, B and A, B types have sugars,
24:39while O has none, which makes it perfect for donors. No sugar doesn't make O type less sweet. In fact,
24:46it attracts mosquitoes even more than the other blood types. People have only 8 blood types,
24:53while cows have 800 and possibly more. Like what? Moo positive and moo negative?
25:00Our fingernails grow way faster than toenails. They grow almost 4 times slower because they have less
25:06damage than fingernails. Even though we stumble on them often, sudden circulation bursts usually don't last
25:13long. Nails don't only help us catch random tiny objects and peel the stickers off. If you didn't
25:20have a rigid structure against which to press, you wouldn't be able to judge how firmly to hold anything.
25:27Very few people can actually digest milk. The thing is, there's some special enzyme,
25:32let's call it a little helper, that breaks down the sugars any milk has.
25:37When people grow up, they run out of this enzyme. This sugar's called lactose, so adults that can't
25:44digest it are lactose intolerant. 68% of the world's population can actually digest milk.
25:52If you're sleeping, it doesn't mean your whole body rests. In fact, sometimes your brain has to work
25:58even harder when you're asleep. It needs to process tons of information, and reports usually take a lot of
26:05time. Humans can't multitask, really. We need time to switch from one task to another,
26:11but if we try to tackle several things at the same time, it's not going to be very productive.
26:17Try this one. Lift your right foot and start rotating it in a clockwise direction.
26:23Try to write the number 6 with your big toe in the air. Now check the direction your foot's moving.
26:29It's moving in the opposite direction, because to write the number 6,
26:33you need to make a counter-clockwise movement. It actually takes a bit longer to start a new habit.
26:39It's not 100% true that 18 or 21 days are enough, as many people think.
26:45The process of getting a new habit can take up to 254 days, but on average,
26:51it takes around 66 days for a new habit to become automatic.
26:55the process of getting more automatic.
26:56everyone knows how important they're gonna be out.