In this book, a geneticist who studies identical twins "treats the view that genes are destiny with skepticism" ( The New York Times). How much are the things you choose to do every day determined by your genes and how much is your own free will? Drawing on his own cutting-edge research of identical twins, leading geneticist Tim Spector shows us how the same upbringing, the same environment, and even the same exact genes can lead to very different outcomes. Thought-provoking, entertaining, and enlightening, Identically Different helps us understand the science behind what makes each of us unique and so quintessentially human.