Pediatrician Nadine Burke Harris is a pioneer in the movement to transform how we respond to early childhood adversity and the resulting toxic stress that dramatically impacts our health and longevity. A survey of more than 17,000 adult patients’ adverse childhood experiences (ACEs), such as divorce, substance abuse or neglect, proved that the higher a person’s ACE score, the worse his or her health. This led Burke Harris to an astonishing breakthrough: Childhood stress changes our neural systems and lasts a lifetime.