Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
There are about 1,400 different species of bacteria in your belly button.
10
Your skeleton keeps growing until you are about 35, then you start to shrink.
74
A person can live without food for about a month, but only about a week without water.
156
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
Fidgeting can burn about 350 calories a day.
201