When I was a kid, childhood meant playing on the street, riding my bike, hanging out with friends.

Most kids now experience a different childhood.

Jonathan Haidt's bestselling book, The Anxious Generation, talks about that. He calls it "a tragedy in two acts."

"Act One, we lose the play-based childhood. We stop letting kids run around outside. We're too afraid they'll get abducted.…We get gradual loss of play from the '90s through the early 2010s.…That sets kids up to be weaker."

Because kids who don't have real experiences are less resilient.

"If you have a play-based childhood with no adult supervision," says Haidt, "you learn to be self-supervising. Sometimes you get lost and you're scared, but you find your way back. Sometimes some mean kids threaten to beat you up, but you either

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