Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The world's shortest man measures only 21.5 inches.
73
A person can live without food for about a month, but only about a week without water.
156
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The human brain uses approximately as much energy as a 10 watt light bulb.
120