It takes 17 muscles to smile, 43 to frown.
65
Only 1% of bacteria cause disease.
45
When your face blushes, the lining of your stomach turns red, too.
154
Human hair and fingernails continue to grow after death.
7
Fidgeting can burn about 350 calories a day.
201
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 human brain doesn't stop developing until about 25 years old.
102