Geoff Peterson is an animatronic human skeleton that served as the sidekick on the late-night talk show "The Late Late Show with Craig Ferguson", often referred to as a "robot skeleton", Peterson is a radio-controlled robot puppet, are animatronics refers to the use of robotic devices to emulate a human or an animal, or bring lifelike characteristics to an otherwise inanimate object, was designed and built by who, of "MythBusters"?