In a windy patch of desert outside ... outfitted in a heavy tan work jacket and a NASA baseball cap, and though it's bitterly cold and windy for us humans, he says the robots don't mind.

In a windy patch of desert outside Barstow, Calif ... Mueller is outfitted in a heavy tan work jacket and a NASA baseball cap, and though it's bitterly cold and windy for us humans, he says the robots ...