"From New York Times bestselling coauthor of The Coddling of the American Mind, an essential investigation into the collapse of youth mental health-and a plan for a healthier, freer childhood. 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 most measures. Why? In The Anxious Generation, social...