Your wounds heal faster if you lick them, you instinctively do this for that reason. Tears help, too.
20
Wearing headphones for an hour increases the bacteria in your ear 700 times.
233
Children are more allergic to cockroaches than they are to cats!
46
The human brain doesn't stop developing until about 25 years old.
102
A person will burn 7 percent more calories if they walk on hard dirt compared to pavement.
45
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 pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
130