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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Tigers can see 6 times better at night than humans.
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Enamel is hardest substance in the human body.
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A person will create enough saliva to fill two average size swimming pools during his lifetime.
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We share 70% of our DNA with a slug.
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You can't tickle yourself.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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.
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