Your fingernails grow faster in summer.
744
Every human spent about half an hour as a single cell.
144
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Early American humans hunted car-size armadillos and used their shells for houses.
12
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
If the human eye was a digital camera, it would have 576 megapixels.
25