Much of what we humans like to think of as politics, morality, and culture is motivated by disease avoidance behavior http://www.psmag.com/navigation/health-and-behavior/bugs-like-made-germ-theory-democracy-beliefs-73958/ …
Replying to @reiver
@reiver @Billare only spanner in the works is arab world which has the highest inbreeding but lowest pathogen rates:http://hbdchick.wordpress.com/2012/08/03/pathogens-and-consanguinity/ …
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