When you take a step, you are using up to 200 muscles.
885
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
About 400 different kinds of microbes live on and in the human body.
-3
Your body is creating and killing about 2.4 million red blood cells per second.
17
Chocolate, sex, and laughter are all important for a healthy brain.
37
The smallest human penis ever recorded was just 5/8 of an inch long!
77


