As a child of eight in 1926, George Thomas Of Sheffield, England, thought nothing of walking six miles to his favorite fishing hole. Today, his eight-year-old great-grandson Edward is forbidden to wander more than 300 yards from home. The London Daily Mail mapped the diminishing scope of childhood roaming through four generations. Grandfather Jack, who turned eight in 1950, could roam through a one-mile radius. Mother Vicky, who turned eight in 1979, could walk unaccompanied half a mile to the local swimming pool. Jack's experience mirrors mine, as a 1953 eight-year-old in Chappaqua, NY, with a roaming scope of about one mile...