When did the kid who strolled the wooded path, trolled the stream, played pick-up ball in the back forty turn into the child confined to the mall and the computer screen? How did "Go out and play " go from parental shooing to prescription? When did parents become afraid to send their children outdoors? Surveying the landscape of childhood from the Civil War to our own day, this environmental history of growing up in America asks why and how the nation's...