The average human body contains enough iron to make a small nail.
50
One quarter of the human brain is used to control the eyes.
43
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
The human brain doesn't stop developing until about 25 years old.
102
Fingernails grow nearly 4 times faster than toenails!
30
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103