There are about 1,400 different species of bacteria in your belly button.
10
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
One human hair can support 3 ounces.
191
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
In one day, adult lungs move about 10,000 litres of air.
11
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22