by 
karan
ANSWERS: 3
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evidence exists that the ancient egyptions, the babylonions, and the chineese way back prior to 300BC did. so you could say it was discovered many times over (bad pun intended)
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Rabbits! Exponentially! : ) (and on a smaller scale, cells)
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Two fellas sitting in a cave who determined that if one had two clubs and he took the other guy's two clubs, he had four total.
Roaring 
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