HAVE SMARTPHONES DESTROYED A GENERATION? More comfortable online than out partying, post-Millennials are safer, physically, than adolescents have ever been. But they’re on the brink of a mental-health crisis. “We didn’t have a choice to know any life without iPads or iPhones. I think we like our phones more than we like actual people.”

Plus: “The shift is stunning: 12th-graders in 2015 were going out less often than eighth-graders did as recently as 2009.”