If you like Galen's Prophecy

Nearly two thousand years ago a physician called Galen of Pergamon suggested that much of the variation in human behavior could be explained by an individual's temperament. Since that time, ideas about inborn dispositions have fallen in and out of favor. Based on fifteen years of research, Galen's Prophecy now provides fresh insights into these complex questions, offering startling new evidence to support Galen's anc…