<p><b>THE NO.1 <i>SUNDAY TIMES</i> BESTSELLER <br><br>¿Jonathan Haidt is a modern-day prophet, disguised as a psychologist . . . He points the way forward to a brighter, stronger future for us all¿ Susan Cain<br><br>''Compelling, readable ¿ and incredibly chilling . . . remarkably persuasive'' <i>Telegraph<br></i></b><br><b>''Urgent and essential'' <i>Guardian<br></i></b><br><b>''One of the most terrifying books I have read . . . some of the statistics Haidt quotes are truly shocking'' <i>Evening Standard</i></b><br><br>After more than a decade of stability or improvement, the mental health of adolescents in many countries around the world deteriorated suddenly in the early 2010s. Why have rates of depression, anxiety, self-harm and suicide risen so sharply, more than doubling in many cases?<br><br>In this book, Social Psychologist Jonathan Haidt argues that the decline of free-play in childhood and the rise of smartphone usage among adolescents are the twin sources of increased mental