Perhaps no toy is as maligned as the yo-yo, despite its long and colorful history. The roots of the yo-yo can be traced back to antiquity, and there is even a Grecian urn in the collection of the Metropolitan Museum of Art that depicts that most well-known of yo-yo maneuvers: walking the dog. Visitors with a penchant for the yo-yo will appreciate the wide range of materials that can be found on...