Cleanliness is key for robotic space explorers

The concrete-floored room looks, at first glance, like little more than a garage. There is a red tool chest, its drawers labeled: "Hacksaws." "Allen wrenches." There are stepladders and vise grips. There is also, at one end of the room, a half-built spaceship, and everyone is wearing toe-to-fingertip protective suits.

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