Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
The human sigh acts as a physiological reset button.
23
A person can live without food for about a month, but only about a week without water.
156
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
The average sperm cell swims at 8 inches per hour.
4
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515