Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
If the human eye was a digital camera, it would have 576 megapixels.
25
Every human spent about half an hour as a single cell.
144
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