Enamel is hardest substance in the human body.
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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
Obsessive nose picking is called Rhinotillexomania.
101
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
The human brain uses approximately as much energy as a 10 watt light bulb.
120
The world's shortest man measures only 21.5 inches.
73
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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