There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The average sperm cell swims at 8 inches per hour.
4
A person can live without food for about a month, but only about a week without water.
156
The human brain is more active during sleep than during the day.
28
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13