There's 100 trillion good bacteria living in your body.
17
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
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
The human sigh acts as a physiological reset button.
23