Enamel is hardest substance in the human body.
61
The average person's skin weighs twice as much as their brain.
131
One human hair can support 3 ounces.
191
Every year your body replaces 98% of your atoms.
119
The human body contains over a billion miles of DNA.
147
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Yawns are more contagious among people with closer relationships.
163