San Diego State University psychology professor Jean Twenge has been studying generational differences for decades. Her latest research focuses on what she calls iGen: the age group that has not known life without the internet. Born between 1995 and 2012, members of iGen have grown up inseparable from their smartphones and according to Twenge are "on the brink of the worst mental-health crisis in decades." Twenge joins Forum to discuss her new book: "iGen: Why Today's Super-Connected Kids Are Growing Up Less Rebellious, More Tolerant, Less Happy - and Completely Unprepared for Adulthood."