Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Babies crawl an average of 200m a day.
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The human brain doesn't stop developing until about 25 years old.
102
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.
34
The human brain is more active during sleep than during the day.
28
Pain occurs when sounds are above 130 db.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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