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(CNN)As the weather has warmed in my Midwestern town, my neighborhood is full of children on bicycles pretending to be riding through the Wild West. I can't walk down the sidewalk without stepping on chalk drawings or hopscotch boards. There are children jumping rope and playing ball. In the eight years I've lived here, I've never witnessed this before. As a clinical psychologist who studies children's friendships, I am fascinated by this development.