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Nice quote, from an interesting article:
"[B]iologists believe intelligence, as manifested in things like artistic and musical ability, is such a reliable indicator of underlying genetic fitness that it has been chosen by members of the opposite sex over the millennia. In the ensuing arms race to show off and get a mate it has been exaggerated in the way that a peacock’s tail is. This process of sexual selection, Dr Miller and his followers believe, is the reason people have become so brainy."Of course exactly what notions of intelligence are being selected seems pretty hazy, but even these might be identified, or identified as to which notions in what historical era of ancient or modern human development were pertinent for such selection.
[image] Chilmark Research
 "Balls and Brains: The quality of a man’s sperm depends on how intelligent he is, and vice versa" The Economist Dec 4th 2008 (Accessed 12/6/2008)