Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species.
Source: On Aggression, in Ecce Homo!, ch. 13, 1963.
-- Konrad Lorenz, (Nov 7 1903-1989), Austro-German ethologist; He pioneered animal behavior studies and imprinting; shared the Nobel Prize in Medicine, 1973.