On this week’s Mechanical Hub update: As I watched the recovery efforts—for the astronauts stuck in space for nine months—live off the coast of Tallahassee, Fla., all I kept thinking about was, “Where have these two astronauts been going to the bathroom for that extended period of time?” I guess I’m not alone in that thought because it is one the most commonly-asked questions for astronauts visiting the space station.

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