Early American humans hunted car-size armadillos and used their shells for houses.
12
The average person's skin weighs twice as much as their brain.
131
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
