"On average, we blink at a rate of 20 times per minute. This is equal to nearly 10,000,000 blinks a year."
"As far as height goes, we stop ‘growing’ after we hit puberty. However, your ears and nose continue to lengthen- due to gravity!"
"Your corneas don’t receive any blood supply whatsoever, so it gets all of its oxygen directly from the air."
"We develop our fingerprints completely by the end of the first trimester in the womb."
"When you blush, so does the inner-lining of your stomach. This is why you get those ‘tingles in your tummy.’"
"When in space, astronauts can grow almost up to two inches."
"Throughout their lifespan, humans go from having 300 bones to 206 bones."
"A human heart can beat outside the body as well."
"All humans are born with a diving reflex, which can shut bodily functions. This gets activated when one drowns or is submerged in the water."
"Your small intestine is taller than you are- clocking in at about 23 feet."
"One-fourth of the bones in a human body are in the feet."
"You are unable to breathe and swallow at the same time."
"Your right kidney is ever so slightly lower than your left one."
"Your stomach acid can disolve metal."
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Astronauts who spend extended lengths of time in microgravity develop many different conditions, some of which cause the body to age more rapidly than it would on Earth. They have to undergo weeks of reconditioning when they return.
A few of them are: redistribution of body fluids, swelling of the brain, change in heart shape, bone density loss, muscle atrophy, lower blood pressure, constricting of the blood vessels, visual acuity, and more...
The soles of the feet thin out significantly from lack of use, and it becomes painful to walk upon return to gravity. Also... lack of gravitational compression along with fluid build up causes the spine to stretch, making the astronauts temporarily taller.