Nature requires balance: “even” on either side, “odd” on the middle. Logically, the third arm would be a prehensile tail. That way I could use both arms forward and pick-up dropped items behind me with my tail. But I guess nature changed us and we benefited more without a tail.
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Reference: http://dailypost.wordpress.com/2011/07/10/if-you-had-a-third-arm/
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