How do our experiences in childhood make us the adults we become? It is one of the great human questions, the theme of countless novels, biographies, and memoirs; the subject of several centuries’ worth of philosophical and psychological treatises. This process—the experience of growing up—can appear at times to be predictable, even mechanical, and at other times to be arbitrary and capricious; we’ve all encountered grown men and women who seem trapped in a destiny preordained by their childhoods, and we’ve all met people who seem to have almost miraculously transcended harsh beginnings.