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Did you know you have useless body parts?
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Sources:
http://www.livescience.com/11317-top-10-useless-limbs-vestigial-organs.html
http://io9.gizmodo.com/5829687/10-vestigial-traits-you-didnt-know-you-had
http://evolution.about.com/od/evidence/ss/4-Vestigial-Structures-in-Humans.htm#step3
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