About 400 different kinds of microbes live on and in the human body.
-3
Chewing gum boosts your brain power.
285
In older people, memory is best early in the morning and then declines during the late afternoon.
33
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
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine.
202
On average, there's 100 billion neurons in the human brain.
83