THE INSTANT #1 NEW YORK TIMES BESTSELLER - A must-read for all parents: the generation-defining investigation into the collapse of youth mental health in the era of smartphones, social media, and big tech--and a plan for a healthier, freer childhood. "Erudite, engaging, combative, crusading." --New York Times Book Review (Editors' Choice) "Words that chill the parental heart... thanks to Mr. Haidt, we can glimpse the...