Twins

by Lawrence Wright

Recent studies of twins have shaken the field of psychology to its foundation, revolutionizing our understanding of our own personalities. Because identical twins separated at birth share all the same genes, yet live separate lives, they offer a unique opportunity to test theories about the roles played by nature and nurture in shaping who we are. Twins directly challenges many long-held beliefs. For instance, a series of groundbreaking studies of twins has shown that our genes play a much stronger role in shaping our identities than previously thought. Today, scientists can actually...