Nowadays, thanks to advances in dentistry, most people keep their teeth for much longer. We can easily replace lost teeth if needed, making wisdom teeth less necessary. Interestingly, fewer adults have to deal with teething pains. Over the past 10,000 years, our jaws have evolved rapidly, especially as our diets changed from hunting to farming. It's just one of many facts that prove how awesome and unique your body is. Prepare to learn more of them and see your own body from a different angle. Animation is created by Bright Side.
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This video is made for entertainment purposes. We do not make any warranties about the completeness, safety and reliability. Any action you take upon the information in this video is strictly at your own risk, and we will not be liable for any damages or losses. It is the viewer's responsibility to use judgement, care and precaution if you plan to replicate.
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FunTranscript
00:00Open your mouth and say, ahhh.
00:03If you're a lucky individual to have no wisdom teeth, then you can be proud knowing
00:08that you're a product of evolution going strong.
00:12As you might know, teeth are the only part of the human body that doesn't repair itself.
00:17So if you lost all your teeth back in the dark times with no dentists around, the only
00:22choice you had was to eat liquid food.
00:26Not cool.
00:28Scientists believe that nature gave us wisdom teeth as a replacement for old, worn-out teeth
00:33we've had since childhood.
00:35That's why they grow so late in our lives.
00:37Today, though, with all the progress dentistry has gone through, we tend to keep all or most
00:43of our teeth intact until a very old age.
00:46And even if we lose some, we can always replace them with new ones.
00:51That makes wisdom teeth a vestigial thing.
00:54And they seem to understand that, since more and more people never have to go through the
00:58ordeal of teething as grown-ups.
01:01Speaking of teeth, our entire jaw has been changing for the past 10,000 years, and is
01:07predicted to change even more quite soon.
01:11In fact, it's been the fastest changer of all our body parts.
01:15Back in the day, when early humans survived by hunting and gathering, they needed massive,
01:21powerful jaws and bigger teeth to chew through raw meat and grind plants.
01:27As they came to cooking and then farming, their food became less tough, and so their
01:32jaws became smaller to fit the current needs.
01:35As time went by, our jaws shrank more and more, and they're likely to continue doing
01:40so in the future.
01:42With lots of processed foods that don't need much chewing, humans of the future are probably
01:47going to have more delicate facial features, with thin jawlines and smooth cheekbones.
01:54Some body parts are not going away, but making a comeback instead.
01:58A hundred years ago, Fabella, a tiny bone in the back of the knee, was only present
02:04in around 11% of people, and scientists thought it would disappear entirely pretty soon.
02:10But against all odds, the brave little bone has made it into the knees of a whopping 39%
02:17of modern people.
02:18It's still unknown why exactly the Fabella returned, but the most popular opinion is
02:24that we've grown taller and heavier than our ancestors.
02:28That much is true.
02:29As our diet became better and more nutritious, we learned to live longer and grow taller.
02:35We're now probably at the peak of our evolutionary height.
02:40And the Fabella might've appeared in our bodies to provide a smooth surface for the
02:44tendon behind the knee to slide on, reducing friction and lowering the chances of damage
02:49because of wear and tear.
02:52Speaking of becoming bigger, let's get you back to that mirror, shall we?
02:57Flux a little bit.
02:59Nice biceps there.
03:01But unfortunately, not as nice as your ancient ancestors were.
03:06Not everything about evolution is 100% good for us.
03:09It's just a set of features that adapt at best.
03:13And that's the case with our muscles.
03:16They've grown smaller and weaker with time, especially in our upper bodies.
03:21In ancient times, humans needed big and strong muscles to do a lot of handiwork.
03:26From hunting and schlepping their catch home to crafting tools and building shelters.
03:31Later, it didn't grow easier.
03:33Much the opposite.
03:34In fact, plowing fields and building complex structures required a lot of physical strength
03:39and endurance.
03:41But as the technological progress started booming, physical capabilities gave way to
03:46brain power.
03:48And machines began doing a lot of work for us, most of it even better than us.
03:54We shifted more towards sedentary lifestyle, spending more and more time in front of computers.
04:00And our muscles have been growing steadily smaller, because we simply don't need them
04:04as much anymore.
04:07It's highly likely that as the progress goes further, we'll become much slenderer and
04:12have more trouble gaining muscle mass.
04:16Our brain is of particular interest because it's been changing in a kind of strange pattern.
04:22Our distant ancestors had a rather small brain at first, but the close relatives of humans,
04:28the Neanderthals, obtained a larger brain than the average modern human has.
04:33In the course of evolution, human brain grew larger.
04:37But in the more recent centuries, it started shrinking, and no one knows exactly why.
04:44Some experts say it might have to do with the change of our lifestyle and social connections.
04:49Early humans, especially hunter-gatherers, had to remember every plant and animal they
04:54saw, their properties, and how to use this or that thing.
04:58They were more generalist, having to learn everything their parents knew and find out
05:02more on their own.
05:05The modern human is more specialized in a certain area, delving deeper into some narrow
05:09subject while relying on their peers for the rest.
05:14Where ancient humans worked in groups in which anyone could potentially replace anyone else,
05:20we gather in teams, where each member has their own specific task and is irreplaceable.
05:26Still, brain size doesn't seem to matter that much, because orcas and elephants, for
05:31example, have bigger brains than us, which doesn't make them more intelligent.
05:36Hey, not to freak you out or anything, but every second, your body creates 25 million
05:41new cells.
05:42I'll do the math for you.
05:44That means that in about 15 seconds, you'll have produced more cells than there are people
05:49in the United States.
05:50Think about that next time you feel you haven't been productive enough.
05:54It may account for only 2% of our body mass, but our brains actually take up 20% of our
06:00blood supply and oxygen.
06:02Our brains can also produce enough energy to supply a lightbulb.
06:05That is, when we're awake.
06:08Ever thought about what the largest human organ is?
06:11It's your skin, and it's thickest on the palms of your hands and soles of your feet.
06:16I know, I know, I hate dusting too.
06:19But you are particularly responsible for that layer of fluff on your TV screen, you know.
06:25Every human being sheds about 600,000 particles of skin every hour, and most of the dust around
06:30your house is actually composed of that.
06:33So yes, we're all rather flaky.
06:36These days, it's considered more of a beauty mark, but the reason why people are born with
06:40a Cupid's bow is actually quite intriguing.
06:44As our features start to develop before we're even born, it appears that the Cupid's bow
06:49is actually the place where our face, well, zips up.
06:53The right side of the face and the left side of the face, that is.
06:56While in humans, it may not be that obvious.
06:59If you look at your dog's nose, you'll see it has a straight vertical line just under
07:03the nostrils.
07:04That's right, dogs have this zip too.
07:07Did you know you were born with more bones than you have today?
07:11At birth, we have somewhere around 300 bones, but as we age, some of them fuse together.
07:17That's why in adulthood, we end up having about 200 bones.
07:22Although your teeth are technically part of your skeletal system, they're not actually
07:25bones.
07:26They do look sort of similar and do share some characteristics, like being the hardest
07:31element in your body.
07:32Why the misconception though?
07:34Well, it's mostly because both teeth and bones contain calcium.
07:38To be a bit more specific, about 99% of the body's calcium is in your bones and teeth.
07:44The remaining calcium is in your bloodstream.
07:47So what makes them different, you might ask?
07:49It's in how the bones and teeth heal and how you should take care of them.
07:53While bones can repair and heal themselves, your teeth aren't able to do that.
07:58That's why we have dentists.
08:00We don't only have unique fingerprints, our tongues are one-of-a-kind as well.
08:05Research has shown that those approximately 10,000 taste buds on our tongues are laid
08:10out in a unique pattern, specific for each one of us.
08:14About 80% of what you believe is taste is actually smell.
08:18The combination of taste and smell that we perceive is what we come to know as flavor.
08:23That's probably because our sense of smell is around 10,000 times stronger than our sense
08:28of taste.
08:30So the next time you're tuning in your favorite song, try to pay some attention to your heartbeat
08:35Do you hear that?
08:36Yep, that's right.
08:38While listening to some music, your heartbeat will sync with the rhythm of the song.
08:43And speaking of that healthy ticker of yours, just in case you're wondering, it beats
08:47on average about 75 times per minute.
08:50This means that in any given year, a human heart can pump enough blood to fill an Olympic-sized
08:55pool.
08:56What's even more fascinating is that if you were to connect all your blood vessels
09:00end-to-end, you'd be able to circle the Earth four times.
09:04But that would really hurt, so don't try that.
09:07We are the only species on this planet to have a chin.
09:11There's still some debate around this subject in the scientific community, but one of the
09:15reasons seems to be to make our jaws stronger.
09:18As humans have continued to evolve, their teeth and the muscles in their jaws got smaller
09:23and smaller, so they needed something to help with increased jaw resistance.
09:28That transparent part of your eye is called the cornea, and it helps the light go through.
09:33It's also the only part of your body that isn't connected to any blood supply.
09:38Why?
09:39Because it's especially designed to get its oxygen straight from the surrounding atmosphere.
09:44If you took out all the fat found in a healthy human body, it would be enough to make 7 bars
09:49of soap.
09:50We also produce enough saliva in our lifetimes to fill two swimming pools.
09:55Great expectorations!
09:57Ever wondered how much we actually eat during our whole lifetimes?
10:01I'll spare you the math.
10:03An average-sized person eats nearly 66,000 pounds of food throughout the whole course
10:08of their lifetime.
10:09How much is that for scale?
10:11About 6 elephants.
10:13And that ain't peanuts.
10:15Each of us carries around 4 pounds of bacteria on average at any given time in our bodies.
10:21But hey, don't go running to the doctor just yet.
10:24Most of that bacteria is actually good and have specific functions in the human body,
10:29like digestion and our immune systems.
10:32If you want to have an accurate depiction of your height, make sure you measure yourself
10:36in the morning.
10:37That's because you're about 0.4 inches taller right when you wake up.
10:42Trust me, it isn't magic.
10:44It's merely because, throughout the day, the soft cartilage between your spinal bones
10:48gets squashed down and compressed, making you seem shorter by the time you go to bed.
10:54Skeleton will renew itself completely within 10 years.
10:57And yes, without surgery.
11:00An adult uses around 200 muscles just to make one step.
11:04So don't tell me I don't work out enough.
11:08Every minute, your body sheds more than 3,000 skin cells.
11:11It's almost 200,000 skin cells per hour and more than 9 pounds per year.
11:17Hey, it's the shedding skin cells weight loss plan!
11:21Ooh, sign up!
11:23But hey, don't worry, you still have about 300 million skin cells at any given moment.
11:28Plus, your skin completely renews itself every 28 to 30 days.
11:32The liver is the only human organ that can regenerate completely.
11:37As little as 25% of the original liver weight can get back to its full size.
11:43Some people can hear their eyeballs moving inside the eye sockets.
11:46Wow, that must be no fun.
11:50Unlike other parts of your body, your ears and nose never stop growing.
11:54Wow, that must be no fun.
11:57Your skin wrinkles if you stay in the water for too long.
12:00But not because it absorbs water.
12:03When your body's wet, wrinkled fingers and toes provide you with a better grip.
12:08You know, like when the treads on your car tires grip the road better when they're new.
12:13Your eyes are an amazing instrument.
12:16They can distinguish between 10 million different colors.
12:20Your brain uses more than 20% of your body's energy even when you're resting.
12:25When you're asleep, it still consumes almost as much power as when you're awake.
12:29It also burns around 330 calories per day at that.
12:34An adult person has about 25% of all their bones in the feet.
12:39Most of them are tiny but crucial.
12:41If these bones are out of alignment, so is the rest of the body.
12:45You breathe around 20,000 times a day, I've counted.
12:49Try not to stop.
12:50I actually set a personal best record today for consecutive days breathing, and I plan
12:55to top that tomorrow.
12:58Human bones are a real paradise.
13:01They're almost 5 times stronger than a steel bar with the same width but can fracture on
13:05impact and are rather brittle.
13:08If a person has asnosmia, also called smell blindness, they can't distinguish and detect
13:14smells.
13:15But they can still be smelly.
13:19You start feeling thirsty when water loss is 1% of your body weight.
13:24More than 5% and you may faint.
13:27Water loss that's bigger than 10% of the body weight and dehydration can end a person,
13:33if you know what I mean.
13:36The strongest muscle in your body, based on its weight, is your jaw muscle.
13:40Yes, mine is way overdeveloped.
13:43At any moment, 50,000 cells in your body are getting replaced by new ones.
13:48Boy, that sounds like a company I used to work for.
13:52By the end of their life, the average person can recall up to 150 trillion pieces of information.
13:58Except for where they left their car keys.
14:01Even if fingerprints are badly damaged, they still go back with their original pattern.
14:06Don't believe me?
14:07Hey, give it a whirl!
14:10Your brain's memory capacity is equivalent to about 4 terabytes on a hard drive, which
14:15is more than 8 million photos.
14:18People are the only living creatures that can naturally sleep on their backs.
14:23Even apes usually sleep in a sitting position, leaning on something.
14:27Don't wake them up!
14:29Your longest bone is your thigh bone, not your funny bone.
14:33And the tiniest one is in the ear, it's shorter than a grain of rice.
14:38Do you feel ticklish when you tickle yourself?
14:41Normally you wouldn't, unless someone else tickles you.
14:44It happens because the cerebellum area of the brain, which monitors movements, predicts
14:49the sensations caused by your own movements.
14:52Then it sends a signal to other parts of the nervous system to cancel these sensations.
14:58But some rare individuals can actually feel ticklish on their own.
15:02If you're not among them, touching a new texture that the brain doesn't yet recognize,
15:07or using a scalp massager, can help to excite your nerves and bring relaxation.
15:12Hey, you can give it a tickle test!
15:15If you want to check out the work of your vestibular system, try this simple trick.
15:21Stand on one foot and close your eyes.
15:24Most people lose balance at least during the first attempt.
15:27Your vestibular system includes many organs and systems throughout the body.
15:32Together, they allow your body to stay in balance in different positions.
15:36This system includes the inner ear and vision, which is why keeping balance is much easier
15:41in silence while your eyes are open.
15:45Can you wiggle your ears intentionally?
15:47Are you popular at parties for doing that?
15:50Congratulations!
15:51Around 22% of people on the Earth are capable of wiggling one ear.
15:56As for moving both ears at once, only 18% can do that.
16:01Ear wiggling used to be a common thing for our distant ancestors.
16:05Scientists believe they could perform a variety of movements with their ears.
16:09The group of muscles responsible for wiggling are called the auriculars.
16:14Mostly don't need it today.
16:16But some people claim that everyone can learn to move their ears.
16:19It only takes time and practice.
16:22Unfortunately, we still cannot acquire this classy habit of twitching an ear toward a
16:26sound source, as dogs and cats do.
16:30Nor can we actually lend an ear to someone.
16:33Or challenging to remove and reattach.