Enamel is hardest substance in the human body.
61
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
The human brain is more active during sleep than during the day.
28
If the human eye was a digital camera, it would have 576 megapixels.
25
A person can live without food for about a month, but only about a week without water.
156
One human hair can support 3 ounces.
191
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
A man's beard grows fastest when he anticipates sex.
239