If these 2 explorers were slightly fatter, it might have never happened.
Find out more:
http://www.pbs.org/wgbh/nova/evolution/dawn-of-humanity.html
http://news.nationalgeographic.com/2015/09/150910-human-evolution-change/
http://www.vox.com/2015/9/10/9301479/homo-naledi-species-hominin?
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