You could almost hear the collective generational sigh of relief in 1970 when Blume published this groundbreaking, taboo-trampling young adult novel: finally, a book that talks frankly about sex without being prim or prurient, and about religion without scolding or condescending. A few months shy of her 12th birthday, Margaret Simon is starting school in a new town and asking God some serious questions. Like, when is she going to get her period? What bra should she buy? And if her mom is Jewish and her dad is Christian, is she supposed to join the Y or the Jewish Community Center? Blume turned millions of pre-teens into readers. She did it by asking the right questions—and avoiding pat, easy answers.—L.G.