The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Held in farts enter your bloodstream and are bad for your body.
26
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
32
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199