Screen time has long been a hot topic for parents. Many think that parenting has gotten harder over the years, with technology being a key reason why.

In her new book, “Smartphone Nation,” social media expert Kaitlyn Regehr helps parents manage their digital media consumption and teach kids healthy tech habits.

About four-in-ten parents say they could be doing better at managing their kid’s screen time. A larger share – 58% – say they’re doing the best they can.

Thinking about science and technology in terms of return on investment misses the point. Here’s what kids really need to know. No lightsaber ever came to be, but I’ve been teaching undergraduates ...