- 7 hours ago
Facts about the human body that will surprise you!
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00:00Some people even see colors as letters and numbers, or hear them.
00:05Those who live closer to the Arctic Circle can name different shades of snow,
00:09because that's what they see all the time.
00:11To others, it's just white.
00:13Some languages only have general names for colors.
00:17For example, dark stands for cool hues, like black, blue, and green.
00:22Colors like white, red, orange, and yellow are all called warm.
00:26Warm. Your eye processes more variations of warmer colors than cooler ones.
00:34There's a tribe in Australia who describes texture, the function of an object, and how it feels instead of its
00:41color.
00:42They don't have any names for colors at all.
00:45The kandoshi, who live on the banks of the Amazon River in Peru,
00:49don't have a word that would describe the very concept of color.
00:52Instead, the name of some yellow bird will be used to describe the yellow color.
00:57Any ripe fruit will stand for red, and unripe fruit for dark green.
01:04A lot of people lose their ability to perceive some colors as they get older.
01:09By around the age of 70, their eye lenses become yellowish.
01:13This natural yellow filter they look through doesn't let them tell blue from purple and yellow from green.
01:21Half of your brain is hardwired to process visual information.
01:25A much smaller part is left to perceive flavor.
01:29That's why the color of food or drink can boost or curb your appetite.
01:33You'll always choose the reddest apple because your brain perceives it as the sweetest and ripest.
01:40There are no naturally blue foods, so you're least attracted to them and can even fear them.
01:45That's why installing a blue light in your fridge or eating from blue plates is a great way to eat
01:50less.
01:53You'll always choose brighter foods and vegetables because they're associated with a richer flavor.
01:58Eating them makes you feel healthier and happier.
02:01Yellow can boost your appetite as you associate it with energy and excitement.
02:06White can trick you into eating more and paying less attention to what you're munching on.
02:10That's because white food seems more harmless in terms of calories.
02:14If you eat from a white plate, you're more likely to overeat as it makes your food look brighter.
02:20Your brain also remembers the color of food wrapping.
02:24If you put salt and vinegar chips into a cheese and onion package,
02:28you might not even notice the difference in flavor while snacking on them.
02:31Food companies know that you'll eat more of whatever they're selling when it comes in different colors and flavors.
02:39Red gives you courage and strength for physical work.
02:42Yellow makes you happier and more productive and confident.
02:46Green brings balance and harmony to the office environment.
02:49Your eyes also love this color.
02:52They don't need time to adjust to it.
02:54Orange gives you a sense of comfort and warmth, so it's perfect for an office lounge.
02:58Orange, birds, fish, and many mammals see the entire color spectrum in all its glory, just like humans.
03:07For some animals, good color vision is crucial.
03:10Without it, they won't tell ripe fruit from unripe green fruit.
03:15Whenever we yawn, we use the muscles in our mouth and tongue,
03:19and the contact can squeeze some of the saliva-producing glands.
03:23As a result, we might squirt a tiny stream of saliva without even noticing it.
03:28I had a friend in college who could do it at will.
03:30It was impressive.
03:32It turns out that saliva is basically filtered blood.
03:36Blood is processed thanks to special glands, and special cells absorb its properties.
03:41After that, the blood becomes saliva.
03:44People with red-colored hair are 1% of all people.
03:482% are natural blondes.
03:50Yeah, most people you see with these hair colors have dyed hair.
03:53Black is the most common hair color in the world.
03:57Your memory is affected by your body position.
04:00For example, you're much more likely to recall a situation where you wave to someone
04:05if you stand and wave again.
04:08Most scientists agree that tears that appear out of emotion are a unique human feature.
04:14No other animal is capable of crying because of sadness or joy.
04:19The pupils narrow and expand in order to control the incoming light.
04:24If there's a lot of light, they narrow the passage for light so as not to harm the vision.
04:29In the dark, the pupils expand to capture as much light as possible.
04:34The tongue has a lot of muscles, and some of them can strain only when you're learning a new language.
04:40A human bite almost always becomes infected because of all the bacteria that live in our mouth.
04:46In this sense, we're quite close to hyenas.
04:49Your bones are designed to be used a lot daily,
04:52and some of them can absorb 2 or even 3 times your body weight.
04:57That's impressive, but your teeth are even stronger.
05:01Even if you brush your teeth twice a day and never forget about mouthwash,
05:06your mouth still stays one of the dirtiest parts of the human body.
05:10Ugh!
05:11Millions of bacteria live inside it.
05:14The good news is that most of these bacteria are good for the body
05:17and protect it from bad bacteria and viruses.
05:20In the morning, you're taller than in the evening.
05:24While sleeping, you're no longer affected by the force of gravity,
05:27and your spine stretches.
05:28Too bad you become shorter by daytime, though.
05:31A roller coaster actually tosses your organs around,
05:34so you feel like your stomach's falling down.
05:36It's actually flipping inside your body.
05:39You think your fingerprints are the only unique thing in your body?
05:43Well, they're not.
05:44Your tongue print and your smell are also one of a kind.
05:48If anyone sniffs you, it's reason enough to get suspicious.
05:52If all your blood vessels were stretched into a single line,
05:55boy, that would hurt, but it would go around the earth more than twice.
05:59An impressive feat that you wouldn't see because, well, you can't live without your blood vessels.
06:06Toothache and headache are linked together thanks to the trigeminal nerve.
06:10It goes through the jaw right to the head,
06:12so that when you feel tooth pain, it usually goes hand in hand with that in your head.
06:17You lose calories doing literally anything.
06:20A healthy 8-hour sleep, for example, makes you lose up to 800 calories.
06:25And yes, you spend energy even while eating.
06:29A person can go without food for more than 20 days.
06:32However, if you don't sleep for 10 days, your body will simply stop functioning.
06:36Talking about sleep, the average person forgets 90% of their dreams.
06:41And maybe that's a good thing.
06:43Otherwise, imagine how crazy the world would have been.
06:46The color of your dreams is affected by the TV you watched as a kid.
06:50If you're of an older generation that watched black and white TV,
06:54you'll see monochrome dreams more often than not.
06:56If you're used to color television, your dreams will also be colorful.
07:03Out of every 10,000 people on earth,
07:05one person has their organs mirrored or reversed from their usual and customary positions.
07:11That is, their liver would be larger on the left side
07:14and the kidney would be a bit superior to the left one.
07:18People with light-colored eyes, blue or green,
07:21are better at tolerating pain than those with dark eyes.
07:24Scientists think it might be related to melanin that affects the color of the eyes.
07:28The length of your foot is similar to that of your forearm.
07:32Don't believe me?
07:33Go check.
07:33I'll wait right here.
07:35Nah.
07:37We have seven major holes in our bodies.
07:40Our mouths, our ears, nose, eyes, and our, you know, down under.
07:45Hey, we're Australian.
07:47G'day, mate.
07:47We're also a Taurus, if you dig geometry.
07:51A human ring, a donut, a life buoy, or even a bagel.
07:56Mmm, bagel.
07:57Don't forget the schmear.
08:00Seriously?
08:00Counting the pores in your skin and the rest,
08:03there'd be millions of holes, though.
08:05Trillions more likely.
08:06Holy cow, we're holy.
08:09Bodies throw thermal radiation off as a tiny amount of light.
08:13This light is 1,000 times less visible than normal light,
08:16so you're not a torch yet.
08:19Breathe in deep through your nose.
08:21Air only goes up one nostril at a time,
08:23and our nostrils take turns at it.
08:25Sharing is caring.
08:27Our brains tell us when our bodies hurt,
08:30but they can't feel pain themselves.
08:31There are no pain receptors in the brain.
08:35That feeling of your stomach rising is what actually happens.
08:39Hold on.
08:40Every human has a unique smell, except for identical twins.
08:43They share the same DNA and the same smell.
08:46Our fingerprints aren't just for identifying us to the police
08:50if we've done something wrong.
08:51The ridges allow our skin to stretch
08:53to prevent damage and improve our sense of touch.
08:59When you're scared,
09:00you can become a lot stronger than you were before.
09:02Maybe not lift a car strong,
09:04but you won't feel pain or fatigue as quickly.
09:07Our skin is the biggest and fastest growing organ.
09:11Strong, but flexible.
09:13It's a waterproof, yet breathable barrier
09:15that keeps us safe from the external world.
09:18Our skin regenerates itself.
09:20It helps with regulating body temperature
09:22and reduces water loss.
09:25This has helped us to evolve into what we are today.
09:28Our skin developed melanin,
09:30a natural pigment that blocks harmful UV radiation.
09:34Special sweat glands helped our ancestors regulate their temperature
09:38while walking long distances in unpleasant conditions.
09:42Your body has between 2 and 5 million sweat glands.
09:46The more active you are, the more sweat they produce.
09:50Your body has a mechanism to recognize it's time for you to cool off
09:54so you can keep up with the workout.
09:59Breathing isn't only about moving the air inside and outside.
10:03It's about the way you do it
10:05because it can literally affect your face shape.
10:08If you breathe through your nose,
10:10you'll get well-defined cheekbones over time.
10:13It will also make your face wider
10:15because your tongue will exert force against your jaw.
10:19If you breathe through your mouth,
10:21your tongue won't have a place to rest.
10:23It will change your facial structure as time goes by.
10:26Your face can be more narrow
10:28and your cheekbones won't be that visible.
10:32Also, if you're a mouth breather,
10:34you'd probably tend to tilt your head backwards more.
10:36This way, you increase cranial contents
10:39in the back part of your brain
10:40and directly change your entire posture
10:43along with the shape of your neck and face.
10:48Millennials or people born between 1981 and 1996
10:52are more forgetful than older people.
10:56The main cause of their forgetfulness
10:58comes from higher levels of stress.
11:00So hey, chill.
11:02Your left lung is smaller than the right one
11:04because it shares space with your heart.
11:08Humans don't have such big teeth as a tiger shark
11:11or so many of them.
11:13But research says
11:14even though sharks have teeth
11:16coated with really tough enamel,
11:19they're not stronger than ours.
11:21We have proteins that glue our teeth together
11:24to stop the entire tooth from cracking.
11:26We don't lose them, unlike sharks.
11:29Their teeth aren't attached to their gums
11:31on a root like ours.
11:32So, they approximately lose one tooth every week.
11:38Ever wondered why you have toenails?
11:40Nails are made of keratin.
11:42That's a protein you can find in fur,
11:45claws, hooves, and hair.
11:47Unlike claws, our nails are flat and wide.
11:51They shield the tips of our toes
11:53and fingers from injuries.
11:55Also, thanks to fingernails,
11:58we have a rigid backing
11:59that helps us grab and separate different objects.
12:02It would be hard to peel a sticker from the backing
12:04or pick up a jigsaw piece without nails.
12:08Apes and monkeys use their feet
12:10for similar delicate tasks as well.
12:12Scientists think that primates evolved nails
12:15to tightly grasp branches,
12:17remove ticks,
12:18and do other similar things.
12:22The human body glows in the dark,
12:25which means we're faintly bioluminescent.
12:27But that light is 1,000 times weaker
12:30than our eyes can see.
12:32Other animals will easily spot our faint light, though.
12:37Your eyes are pretty sensitive.
12:39You almost never get the chance
12:41to see how sensitive your eyes are
12:43because of all the light
12:44constantly surrounding you.
12:47Human cells are only 43%
12:50of the total cell count in your body,
12:52and the rest are microscopic colonists.
12:56That means you're mostly made up
12:58of bacteria and fungi.
13:00So basically,
13:01you're the mix of the DNA of gut microbes
13:03and your own DNA.
13:06The most abundant element
13:08in the human body is oxygen,
13:10at 65%,
13:12but it also contains lithium,
13:14cobalt, gold, and uranium.
13:17The rarest one of all is radium.
13:21On average,
13:22humans yawn 20 times a day,
13:24partially spontaneously.
13:26For example,
13:27when you're tired,
13:28but sometimes
13:29when someone yawns near you.
13:31Scientists think
13:31it could be a thing
13:32called social mirroring.
13:34Usually when animals mimic others,
13:36they recognize some action
13:38as useful,
13:39so they decide to do it too.
13:41With humans,
13:42it happens when someone
13:43crosses legs,
13:44laughs,
13:45smiles at you,
13:46or yawns.
13:49Hot coffee can taste better
13:51than cold coffee.
13:52Your taste bud receptors
13:54are most sensitive
13:55when your food is at
13:56or a little bit above
13:58room temperature.
13:59Hot coffee can then
14:00seem less bitter
14:01because taste buds
14:02that detect bitterness
14:03are more sensitive
14:04when the coffee is cold.
14:07Your pinky
14:08is a powerful little thing.
14:10Without it,
14:10your hand would lose
14:11a significant part
14:12of its power.
14:14Your index
14:15and middle fingers
14:16cooperate with your thumb
14:17to grab and pinch,
14:18and your pinky,
14:19together with your ring finger,
14:21provides grip strength.
14:23Your bones
14:24are four times harder
14:26than concrete.
14:27The strongest bone
14:28in your body
14:29is the femur.
14:30It can support
14:32up to 30 times
14:33the weight
14:33of a grown-up person.
14:35Even crazier
14:36is that our bones
14:37are made up
14:37of composite material,
14:39meaning they're both hard
14:40and elastic
14:41at the same time.
14:45The outer layer
14:46of your skin
14:47is thicker
14:48on your feet
14:49than on other parts
14:50of your body.
14:52The heart
14:52has its own
14:53electrical system
14:54and can continue beating
14:55even when it's
14:56disconnected from the body.
14:58The average lifespan
15:00of one eyebrow hair
15:01is four months.
15:03We spend 40%
15:04of our life
15:05with our eyes closed.
15:07Most of that time
15:08is when we're sleeping,
15:09but don't forget
15:10to count blinking too,
15:11or while driving.
15:13In an adult,
15:14the blood makes up
15:157-8%
15:16of the total body weight.
15:17About 55%
15:19of your blood
15:19is liquid plasma.
15:21The rest is red
15:22and white blood cells
15:23and platelets.
15:24They form clots
15:25and prevent bleeding.
15:28You can't swallow
15:29and breathe
15:29at the same time.
15:31The food you swallow
15:32and the air you breathe
15:33go down the same part
15:34of your throat
15:35at first.
15:36Only a bit deeper,
15:37the passage splits
15:38into the esophagus
15:39and trachea.
15:42There's a name
15:43for the growling sound
15:44your stomach makes
15:45when you're hungry.
15:46It's called
15:47barbarygmy.
15:50About one-third
15:51of all people
15:52can raise one eyebrow,
15:53left or right.
15:55It's a great way
15:56to send a playful signal
15:57to someone
15:58while telling a joke,
15:59but the ability
16:00to raise both eyebrows
16:01separately
16:02is much rarer.
16:03If you're not among them,
16:05that's because
16:05you cannot yet control
16:07and move
16:08the corresponding muscles,
16:09but this skill
16:10can be developed.
16:12Stand in front
16:13of a mirror.
16:14Hold one eyebrow
16:15with your hand
16:16and lift the other
16:17up and down
16:18and then do the same
16:20with the other eyebrow.
16:21This will help you
16:22learn moving them separately.
16:26If you can lick
16:27your elbow easily
16:28or touch your thumb
16:29to your forearm,
16:30congratulations!
16:31You're among
16:32the minority of people,
16:33but some people
16:34bring flexibility
16:35to the next level.
16:36This condition
16:37is called
16:39hypermobility.
16:39It allows rare individuals
16:42to twist their bodies
16:43into weird positions
16:44just like a snake,
16:45putting their head
16:46between their feet,
16:47doing a back bridge,
16:48and all sorts of splits.
16:49But in some cases,
16:51hypermobility
16:52can increase sensitivity
16:53because such people
16:54have a larger medulla.
16:56This brain area
16:57is responsible
16:58for processing emotions.
17:01These fearless heroes
17:02can walk in the cold
17:03wearing only swimming trunks
17:05and feel cozy.
17:06They can stand
17:07in the snow barefoot
17:08and even swim
17:09in a river
17:09or an ice hole.
17:11Usually,
17:12this talent
17:12doesn't come naturally.
17:14People temper
17:14their bodies
17:15for years
17:16until they get used
17:17to withstanding
17:17extreme cold.
17:18Of course,
17:19they don't do it
17:20just to look cool
17:21or feel cool.
17:23Do you feel ticklish
17:25when you tickle yourself?
17:26Normally,
17:27you wouldn't
17:27unless someone else
17:28tickles you.
17:29It happens because
17:30of the cerebellum area
17:31of the brain,
17:32which monitors movements,
17:33predicts the sensations
17:34caused by your own movements.
17:36Then,
17:37it sends a signal
17:38to other parts
17:38of the nervous system
17:39to cancel
17:40these sensations.
17:41But,
17:42some rare individuals
17:43can actually feel ticklish
17:44on their own.
17:45If you're not among them,
17:46touching a new texture
17:47that the brain
17:48doesn't yet recognize
17:49or using a scalp massager
17:51can help to excite your nerves
17:53and bring relaxation.
17:56Stand in front of a mirror.
17:58Open your mouth
17:59and try to roll
18:00the sides of your tongue
18:01up towards each other
18:02to make a U-shape.
18:03About 65% to 81%
18:05of people
18:06are natural tongue rollers
18:07and the majority
18:09are women.
18:10Some believed
18:11it's a genetic capability,
18:12but recent studies showed
18:13that people can actually
18:15develop this skill
18:16by practicing.
18:18Kachari Mudra
18:19is a term from yoga
18:20that means curling
18:20the tip of your tongue
18:21back into the mouth.
18:25Can you wiggle
18:26your ears intentionally?
18:28Congratulations!
18:28Around 22% of people
18:30on the earth
18:31are capable of
18:32wiggling one ear.
18:34As for moving
18:34both ears at once,
18:36only 18% can do that.
18:38Ear wiggling
18:39used to be a common thing
18:40for our distant ancestors.
18:42Scientists believe
18:43they could perform
18:44a variety of movements
18:45with their ears.
18:47The group of muscles
18:48responsible for wiggling
18:49is called the auriculars,
18:51and we mostly
18:52don't need them today.
18:53But some people claim
18:54that everyone can learn
18:55to move their ears.
18:56It only takes time
18:58and practice.
18:59Unfortunately,
19:00we still can't acquire
19:01this classy habit
19:02of twitching an ear
19:03towards a sound source
19:04as dogs and cats do.
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