Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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There are about 1,400 different species of bacteria in your belly button.
10
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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In one day, adult lungs move about 10,000 litres of air.
11
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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