>> And yet IQ (which is a pretty good proxy for intelligence) is a highly inheritable trait, as shown by several twin studies. Given the tight coupling between

>> And yet IQ (which is a pretty good proxy for intelligence) is a highly inheritable trait, as shown by several twin studies. Given the tight coupling between culture and IQ tests, it's not necessarily proof of inheritability. Twins raised in the same household have nearly identical cultural exposure. (Unless the control is an adopted child of the same age, raised in the same household...)