For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are about 1,400 different species of bacteria in your belly button.
10
Your heart will pump about 212 million liters in its lifetime.
26
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
A person can live without food for about a month, but only about a week without water.
156
In one day, adult lungs move about 10,000 litres of air.
11
The human sigh acts as a physiological reset button.
23
