In his closing argument before jurors in the O.J. Simpson murder trial, Deputy District Attorney Christopher A. Darden described Simpson as being “out of control” when he allegedly killed his former wife and Ronald Goldman. Mr. Darden pointed to a series of events in the hours before the brutal killings that, having ignited the short...

Since its publication late last year, The Bell Curve by Charles Murray and the late Richard Herrnstein has encountered a barrage of criticism for emphasizing the societal implications of IQ differences. Some critics argue that the work rests upon “bogus” and “outdated” theories of intelligence. Others charge that the book promotes dubious scientific claims. One...