- The internet is full of videos
listing unbelievable facts about your body,
but they're not always based on the most reputable sources.
So I've gone ahead and found 40 facts about your body
that have been verified with reputable scientific sources.
And also, thank you to Google for sponsoring this video.
Pee-woop!
Fingernails grow twice as quickly as toenails.
Your pinky fingernail grows slower
than all of your other nails.
Over the course of 10 years,
the entire human body will regenerate
an entirely new skeleton.
Eyelashes take one to two months to grow to full length.
Your body produces a liter of saliva every day.
(Mike gurgling)
The smallest bone in your body is the stapes.
It's located inside your ear.
You actually have a third eyelid or what's left of one.
The plica semilunaris is this small, fleshy spot
on the inside corner of your eye, and it's vestigial,
meaning that it's leftover from our ancient ancestors.
Many creatures on earth have a fully functional third eyelid
to clean and protect the eye between blinks.
If you laid out your blood vessels end to end,
they will wrap all the way around the Earth four times.
(imitates explosion)
The human heart can actually continue beating
on the outside of the body.
The heart's internal pacemaker allows it
to continue beating independently from the brain
as long as it still has an oxygen supply.
The left lung is smaller than the right lung
'cause the heart's got to go somewhere, folks.
Enamel of human teeth is just as hard
as the enamel of shark teeth.
The cornea is the only part of the human body
that does not receive oxygen through the blood.
It does so through the air.
On average at rest, women's hearts beat faster than men's.
Teeth are the only body part that cannot heal themselves.
The strongest muscle based on its weight is the masseter.
With all the muscles of the jaw working together
to close the teeth, it can do so
with a force as greatest 55 pounds on the incisors
or 200 pounds on the molars. (grunting)
Onions produce the chemical irritant known
as syn-Propanethial S-oxide.
It stimulates the eyes' lacrimal glands
so they release tears.
Boo-hoo.
By the way, I found so many inaccurate claims
when starting this video.
That's why it's good to remind ourselves
to think more critically when looking
for quality information online.
Which is why I began my research using Google search
as Google is committed
to ensuring quality information online.
I researched every fact
in this video using medical journals,
peer-reviewed medical studies,
sometimes even specialty experts.
For example, I saw some claims that were like,
"Your blood type determines your personality,"
and right away I took a minute to step back
and fact checked that information.
I started as always with Google search,
and wouldn't you know,
the search led me to a peer-reviewed scholarly article
debunking that claim.
One of the great things about Google search is
that you can find different perspectives quickly
by looking through the many results
and trying new search terms.
With all the misinformation out there, both medical and non,
I'm grateful that Google is committed
to insuring information quality.
Let's be better consumers of information.
Now back to the facts.
The smallest cells in the human body
by volume are sperm cells.
The largest cell in the human body is the ovum.
Interesting.
A teratoma or a dermoid cyst is a tumor
that can be made up of tissue, hair, muscle,
and sometimes even grow their own teeth.
Women's brains shrink during pregnancy.
The human brain contains 100 billion neurons
and 10 to 50-fold more glial cells.
Stomach acid is one of the most acidic substances
in the world, having a pH of just 1.
It's so acidic that it can dissolve many metals.
However, the enzymes in your stomach are incapable
of digesting plastic, so if you swallow some plastic,
it's coming out exactly the same on the other side.
5 to 15% of the calories you burn during the day
actually come from digesting the food you eat.
Approximately 100 trillion microorganisms,
most of them bacteria, but also viruses, fungi,
and protozoa exist in the human GI tract
known as the microbiota.
Cilia in your nose, those little hairs,
actually continue moving up to about 20 hours after you die.
Oh, oh. Whoa!
Women's noses have up to 50% more neurons than men's noses,
giving them a better sense of smell.
You know your five senses:
sight, taste, touch, sound, smell,
but did you know that you actually have more?
Proprioception is your body's sense of where it is in space.
So just knowing where your body parts are
without actually having to see them.
Equilibrioception is our sense of balance.
Thermoception is our sense of determining
what the temperature is outside.
Nociception is our ability to feel pain.
Chronoception is how we sense the passing of time.
And while we may have more than five senses,
there are actually sense found in the animal kingdom
that our bodies don't have.
The largest muscle in your body is the gluteus maximus,
AKA, your booty.
Aquagenic urticaria is a rare condition
in which urticaria, AKA hives,
develop rapidly after the skin comes in contact with water
regardless of its temperature.
There is no cure.
There are treatments though.
Those who exercise regularly actually sweat sooner
and more often than those who don't.
You can't actually see your taste buds.
Those bumps all over your tongue
are actually called lingual papillae,
and there are four kinds:
circumvallate, fungiform, filiform, and foliate.
They all contain your taste buds
except for the filiform papillae
which is responsible for your tongue's sense of touch.
(Mike slurping)
There are many theories for what causes a brain freeze
or sphenopalatine ganglioneuralgia
and why we feel that harsh pain
when we bite into something cold,
but there is still no official consensus.
What's the deal with that?
Congenital insensitivity to pain, or CIP,
is an extremely rare condition
where human beings actually do not experience
the physical sensation of pain.
While it may sound like a blessing at first,
it's actually a curse
because these people never know
when their body's actually in harms way.
Think about touching a hot stove.
Our body's system of balance is determined inside our ears
where three small canals containing tiny hair cells move
when liquid sloshes back and forth,
back and forth, back and forth,
back and forth, back and forth.
I'm getting dizzy.
Your tongue has a print on it just like your fingertips.
And like your fingertip, your tongue print is unique.
In the future, it could be used as a way
to unlock your phone.
A stickier, grosser way, but certainly a way.
Demodex are small species of mites
that live on your eyelashes,
sometimes even being responsible for your acne.
Another vestigial reaction our body has is goosebumps,
which raise the hair on your body.
This doesn't do much for us humans today,
but millions of years ago
when our ancestors had much more hair on their bodies,
it was used to make us warm
and to make us actually look bigger
to scare off impending predators. (groans)
The pinky finger
and its associated muscles are actually responsible
for 50% of your hand's strength. (grunting)
(metal squeaking)
Your liver might not be something you think about very often
but it's putting in more work than you realize.
Your liver is actually responsible
for upwards of 500 individual functions,
including production of bile and cholesterol,
cleaning your blood, and metabolizing toxins.
You don't need a juice cleanse,
you just kinda need a liver.
Now check out a video with 50 facts about me.
I can personally verify they are all very true.
Facts. Fax, no printer.
As always, stay happy and healthy.
And also, thank you to Google for sponsoring this video.
(cheerful music)