It takes approximately 12 hours for food to entirely digest.
93
Gorillas can catch human colds and other illnesses.
205
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
The human eye blinks an average of 4,200,000 times a year.
233
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
One human hair can support 3 ounces.
191