In Nagoya, Japan, at the world's most advanced unmanned one of factories robots are singing on the job. As it moves down the production line al the Machinery Works a large red transport robot hums, Yamazaki Take My Hand, I'm a Stranger in Paradise Nearby, another robot offers s a selection from ven Why do these mechanical marvels sing while they work? Since the robots move freely throughout the factory enginecis have programmed them to switch on their music when they are in motion. warning the plant's few human workers of their presence