Let's say, just for the sake of argument, that there are some intelligent people out there who have never read anything by Thomas Sowell. (I know, I know, the chances are remote, but work with me here.) They've never enjoyed his fascinating excursion into group traits in "Ethnic America," nor his penetrating analysis of what has gone wrong with the schools in "Inside American Education," nor his brilliant dissection of the inevitable pitfalls of regulation in "Knowledge and Decisions." There is hope. His new volume, "Black Rednecks and White Liberals," offers a taste of some of his earlier work as...