Somewhat related: presence or absence of diseases in an area may influence social and political systems, according to one theory (http://www.psmag.com/navigatio

Somewhat related: presence or absence of diseases in an area may influence social and political systems, according to one theory (http://www.psmag.com/navigation/health-and-behavior/bugs-like-made-germ-theory-democracy-beliefs-73958/ http://www.psmag.com/navigation/health-and-behavior/bugs-lik...)