Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
A man's beard grows fastest when he anticipates sex.
239
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
There are about 1,400 different species of bacteria in your belly button.
10
It takes about 20 seconds for a red blood cell to circle the whole body.
102
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Dating back to the 1600's, thermometers were filled with Brandy instead of mercury.
16
Although African-Americans make up only 13% of the U.S. population, they accounted for one half of the estimated new HIV/AIDS diagnoses in 2004.
70