iGen: Why Today's Super-Connected Kids Are Growing Up Less Rebellious, More Tolerant, Less Happy--and Completely Unprepared for Adulthood--and What That Means for the Rest of Us

by Jean M. Twenge

If you were going to give advice for a happy life based on this graph, it would be straightforward: put down the phone, turn off the computer or iPad, and do something—anything—that does not involve a screen.