Brad DeLong also weighs in on the Bell Curve issue, by linking to a Thomas Sowell Review of the book in the American Spectator that, in Brad's opinion, is "absolutely devastating". It is indeed damning, but suffers from the citation problem I mentioned below, both when defending and refuting the Bell Curve: it mentions a "vast" amount of "empirical data going back many years", without saying what said data is or where it comes form. While that will be good enough for those willing to dismiss the Bell Curve anyway, it isn't much help in debate or discussion.