After more than a decade of stability or improvement, the mental health of adolescents plunged in the early 2010s. Rates of depression, anxiety, self-harm, and suicide rose sharply, more than doubling on many measures. Why? Phone-based childhoods. Michael talks to social psychologist and bestselling author Jonathan Haidt, on his book "The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of Mental Illness." Original air date 25 March 2024. The book was published on 26 March 2024.