For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Our brains have a negativity bias and will remember bad memories more than good ones.
15
On average, there's 100 billion neurons in the human brain.
83
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Your heart will pump about 212 million liters in its lifetime.
26
Early American humans hunted car-size armadillos and used their shells for houses.
12