From the author of the controversial book The Nurture Assumption comes the first completely new theory of personality since Freud. Judith Rich Harris tackles a question that has long been a mystery: Why do identical twins who grow up together?ame genes, reared by the same parents?iffer in personality? Harris's groundbreaking answer is based on principles of evolutionary psychology, bolstered by evidence from a variety of sources?tudies of language, memory, autistic children, chimpanzees, even ants. The detective work Harris began in The Nurture Assumption has its triumphant conclusion in No Two Alike. This is the story of a scientific quest, but it is also the personal story of a startlingly innovative woman who dared to question the accepted gospel in her field of expertise.