The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Human hair and fingernails continue to grow after death.
7
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Pain occurs when sounds are above 130 db.
124
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The average sperm cell swims at 8 inches per hour.
4
Your fingernails grow faster in summer.
744
Early American humans hunted car-size armadillos and used their shells for houses.
12