I can find much to disagree with in Megan McArdle's post in the Atlantic's blog, but I found this part amusing and useful.

It takes some chutzpah to argue that intelligence is not heritable, and variant—frankly, I don't know why these people are arguing with me when they could be teaching their dog nuclear physics.Megan McArdle (October 05, 2007) - I am my own lodestar