Studies have found that teenagers in many societies, particularly preindustrialized ones, don’t act especially rebelliously and, conversely, spend “almost all their time with adults.” In an article titled “The Myth of the Teen Brain,” Robert Epstein writes, “Many historians note that through most of recorded human history, the teen years were a relatively peaceful time of transition to adulthood.” Apparently, our teenagers’ brains are fine—it is our brains that are underdeveloped.