Most parents track their 18-25-year-old kids on their smartphones. Is that healthy?

Malte Mueller/fStop/Getty Images Imagine it's the 1980s or early '90s, and there's a queue for the pay phone in a college dorm hallway. Students line up, waiting their turn for the once-a-week, brief check-in with a parent. That was the norm, says Laurence Steinberg , a professor of psychology and neuroscience at Temple University. "Parents and their adult children are much closer emotionally these days than they had been in past generations," Steinberg says. …