" All societies that have tried to keep themselves ‘pure,’ from the Confucian Chinese through to the Castilian Spanish to the post-Wilhelmine Germans, have collapsed into barbarism, insularity and superstition. And swiftly enough for us to be certain that the fall was no more connected to the genes than was the rise. There is no gene for I.Q., and there is no genetic or evolutionary timing that is short enough to explain histories or societies. "

― Christopher Hitchens , The Quotable Hitchens from Alcohol to Zionism: The Very Best of Christopher Hitchens