The average person's skin weighs twice as much as their brain.
131
A person can live without food for about a month, but only about a week without water.
156
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
One human hair can support 3 ounces.
191
There's 100 trillion good bacteria living in your body.
17
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
12
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197