Phones are a fact of life in the 21st century, and even if you try to keep them away from your kids, their friends will get devices, possibly without any safeguards, before you know it. If you’re a parent, you’ve probably grappled with the question of when your kid should get a smartphone. There’s a nationwide movement, Wait Until 8th, that argues that devices should be kept out of kids’ hands until they’re deep into middle school. Some families manage to hold out even longer. Andrew Przybylski, a professor of technology and human behavior at the University of Oxford’s Oxford Internet...

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