10 biggest puzzles of human evolution

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Source: http://feeds.newscientist.com/c/749/f/10897/s/1dcb1c29/l/0L0Snewscientist0N0Cspecial0Cevolution0Epuzzle0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm

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