One out of 20 people have an extra rib.
66
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Your body is creating and killing about 2.4 million red blood cells per second.
17
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
On average, women have always lived longer than men.
195
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
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
If your DNA was stretched out it would reach to the moon 6,000 times.
256