Your thumb is about the same size as your nose.
124
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
It takes about 20 seconds for a red blood cell to circle the whole body.
102
One human hair can support 3 ounces.
191
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Every human spent about half an hour as a single cell.
144
A man's beard grows fastest when he anticipates sex.
239