After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Enamel is hardest substance in the human body.
61
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Pain occurs when sounds are above 130 db.
124
On average a woman has 4 sexual partners in her lifetime.
-143
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are about 255 babies born worldwide every minute.
46