Did you know that babies can only see in black and white? Or that one of your hairs can last up to 7 years on your head? These are 25 unbelievable facts about the human body.

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The average human will shed 40 pounds of skin in their life
The only reason the acid in your stomach doesn't eat right through your body is because the stomach cells are renewed faster than they are destroyed
Your stomach acid is even strong enough to dissolve razor blades
In order to taste something your mouth has to be able to dissolve it. Try drying off your tongue before eating your favorite candy...
Your brain uses up about 20% of all your body's oxygen and calories
Apart from identical twins every single person on Earth has a unique smell
A higher IQ is correlated with more dreams
You are about 1 cm shorter at night because the cartilage between your bones is compressed throughout the day
Your feet have half a million sweat glands that produce over a pint of fluid everyday
There are over 300 million capillaries in your lungs. If you stretched them out end to end they would reach across the United States
If you laid all of your blood vessels end to end they would stretch 60,000 miles, or around the world nearly two and a half times
Women blink twice as much as men
Men get hiccups twice as much as women
During your lifetime, you will produce enough saliva to fill two swimming pools.
After eating too much, your hearing is less sharp
By age sixty you will have lost half your taste buds
Babies can only see black and white when they are born
Your cornea is the only part of your body without a blood supply. It gets its oxygen directly from the air
You knew that 75% of your body is water, but did you know that 80% of your brain is water?
The average lifespan of a human hair is 3-7 years
Aside from being flammable, human hair is exceedingly difficult to destroy even with strong acids
The human body may appear fragile but it's possible to survive even with the removal of the stomach, the spleen, 75 percent of the liver, 80 percent of the intestines, one kidney, one lung, and virtually every organ from the pelvic and groin area.
A full bladder is roughly the size of a softball
Most babies are born with blue eyes. Exposure to ultraviolet light (the sun) and melanin are what eventually bring out their true color