Thanks to reluctance to confront the possibility of a genetic component in racial differences, Americans have a false impression of the state of expert opinion on this question. As the prefatory quotes make evident, a competent scholar, untainted by racial bias, has led group of psychologists who, for more than thirty years, have believed that genes play a larger role than environment in causing the historic IQ gap between black and white (of about 15 points). For almost thirty years, I have disputed their position, without vilification and while conceding that the evidence is indecisive. I think they are probably mistaken, but anyone who tells you that they are certain is, in my opinion, either ignorant or unwilling to squarely face the evidence.