This story originally appeared in Kids Today, Vox’s newsletter about kids, for everyone. Sign up here for future editions. At about 10 am local time on school playgrounds across the United States, kids are climbing on jungle gyms and whooshing down slides. They’re playing bandage tag or foursquare. They’re walking around the track, quietly catching up with their friends.   Those are the lucky ones. Recess, experts agree, is one of the most crucial parts of a child’s school day.  “When kids get to play, and especially outside, they get to feel joy, they get to feel connection, they...

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