(bouncy, lively music)
- [Voiceover] Number ten, you're actually taller
in the morning than you are in the evening.
Most people don't know this,
but a person's height is far from consistent.
When you first wake up in the morning,
you're at your tallest height.
It turns out that on average,
you're approximately one half inch taller
when you wake up in the morning,
and are half an inch shorter when you go to sleep.
This is because of fluid between your spinal discs.
During the day, your body has to deal with
the stress of standing, so the discs become compressed
and fluid seeps out.
While you are sleeping, these fluids are replenished,
causing your height to noticeably change
throughout the day.
Number nine, your stomach manufactures
a new lining every three days to avoid digesting itself.
As a part of the digestive process,
your stomach secretes hydrochloric acid,
which is a powerful corrosive compound
also used to treat various metals.
The acid your stomach secretes is so powerful
that it can digest your stomach.
But mucus lining on the stomach wall
keeps your hydrochloric acid contained
within your digestive system.
In order to maintain the fight against your stomach acid,
your body has to continuously replace the mucus lining
within your own stomach.
Number eight, your sweat actually doesn't even smell bad.
A stinky body odor is only caused when bacteria
that covers your skin begins to feed on your sweat.
The waste products created by this bacteria
is what actually produces the foul odor of sweat.
Number seven, the cracking sound made by knuckles,
necks, backs, and other joints when they are cracked
is the sound of bubbles popping in the fluid inside
your joints.
But the real question that everyone probably wants to ask
is, "Is it bad to crack your knuckles?"
It turns out that it's actually not that bad for you.
With that being said, cracking a joint too often
can damage the ligaments that surround your joints.
Number six, your salivary glands produce two to six
cups of saliva in a single day.
Six cups of saliva would come close to filling
a big, two liter soda bottle.
Most people are surprised by the amount of saliva
produced by the human body,
but this is only because you aren't conscious
of the sheer volume of saliva being produced
inside your mouth each and every day.
Number five, our bodies can and do physically react
to our social situations.
Loneliness is experienced as a physical pain.
Just as you have a drive to avoid physical pain,
you have a similarly powerful drive to connect
with others and seek companionship in order to avoid
the pain of loneliness.
Number four, a single human sperm contains
the 37.5 megabytes of male DNA required to create
a human child.
That means an average ejaculation transfers
over 1,500 terabytes of information,
but most of that information is redundant.
Number three, you're a little richer than you might think.
Human bodies are not just made of carbon water.
Inside all of us, is around 0.2 milligrams of gold,
most of which is in our blood.
But in order to extract any meaningful amount of gold
from people's bodies, you'd need to extract the blood
of around 40,000 people.
If you were able to accomplish this,
you could theoretically collect enough gold
to make one eight-gram gold coin.
Number two, the human brain uses 20 percent
of the entire body's oxygen and calorie intake,
despite only accounting for about two percent
of an adult body's mass.
The mass of human brain is also the reason
why you take so long to mature and sexually develop.
The payoff speaks for itself.
You may feel dumb, but you're smarter than every
other animal on the planet,
and that's because of your expensive resource-hogging brain.
Number one, the need to breathe so much is due
more to carbon dioxide build-up more than the need
for oxygen.
If there was a different way to get rid of carbon dioxide
from the blood, we would only need to breathe
at a rate of about once per minute.
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