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
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Chocolate, sex, and laughter are all important for a healthy brain.
37
The male fetus is capable of attaining an erection during the last trimester.
75
Every time you lick a stamp, you're consuming 1/10 of a calorie!
47
Smoking while pregnant increases the chances of spontaneous abortions (miscarriages) stillbirths and premature labor.
77
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Sitting straight upright in your chair is bad for your back. You should instead slouch at an angle of 135 degrees.
10