http://www.freakonomics.com/article3.phpThis is long but a must read.
"Roland G. Fryer Jr. is 27 years old and he is an assistant professor of economics at Harvard and he is black. Yes, 27 is young to be any kind of professor anywhere. But after what might charitably be called a slow start in the scholarly life, Fryer has been in a big hurry to catch up. He was in fact only 25 when he went on the job market, gaining offers from -- well, just about everywhere. He abruptly ended his job search by accepting an invitation to join the Society of Fellows at Harvard, one of academia's most prestigious research posts."