Genetics or culture? It's not culture. https://www.youtube.com/watch?v=OaTO8_KNcuo&feature=kp …
OK, maybe it's partially culture. https://www.youtube.com/watch?v=uCxpOuMWntg …
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OK, maybe it's partially culture. https://www.youtube.com/watch?v=uCxpOuMWntg …