There are about 1,400 different species of bacteria in your belly button.
10
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
The human brain doesn't stop developing until about 25 years old.
102
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
The human brain uses approximately as much energy as a 10 watt light bulb.
120
A person can live without food for about a month, but only about a week without water.
156