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
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.
15
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
35
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Yawns are more contagious among people with closer relationships.
163
A man's beard grows fastest when he anticipates sex.
239
Human hair and fingernails continue to grow after death.
7