This book is a conversation starter -- not the last word, but instead an early word on moving beyond the supposed firewall between ought and is. Well, argued, thorough, and very thought provoking, Harris synthesizes and crystalizes several converging lines of evidence and argument in philosophy, neurology, biology, and the social sciences to argue that 1) Morality is real, 2) it is accessible to the scientific method, and 3) scientific knowledge of morality is unlikely to lead to prescriptive uniformity. Startling, ballsy, and guaranteed to provoke hearty argument even among those sympathetic to his point of view, Harris has thrown another grenade into the cocktail party of American culture. Worth the read.