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Like a dissected mechanical insect, the hand-sized walking robot Unibug 3.2 (left) reveals its fifty-component construction to the camera's gaze. Designed by Los Alamos , New Mexico, researcher Mark Tilden, Unibug uses simple analog circuits, not the digital electronics that are in most robots, to poke its way around an amazing variety of obstacles. Digital machines must be programmed to account for every variation in their environment, Tilden argues, whereas analog machines can minimally compensate for new and different conditions. From the book Robo sapiens: Evolution of a New Species, page 116.