Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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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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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
In one day, adult lungs move about 10,000 litres of air.
11
Your fingernails grow faster in summer.
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On average, there's 100 billion neurons in the human brain.
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