A man's beard grows fastest when he anticipates sex.
239
There are about 1,400 different species of bacteria in your belly button.
10
Bearing a male child can alter a woman's brain by leaving male DNA that can persist for the rest of her life, making her less likely to suffer from Alzheimer's disease, promote tissue repair, and improve her immune system.
16
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
When you take a step, you are using up to 200 muscles.
886
From the age of thirty, humans gradually begin to shrink in size.
1
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
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22