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Tim Peake has already conducted a historic space walk, so it’s no surprise he’s onto his next endeavor: explaining how astronauts use the bathroom in zero gravity. On Wednesday, the British space traveller shared a video on Facebook of himself answering what Peake calls the most popular question about his journey. “Take the cap off, turn on the fan and the air flow keeps everything going down the pipe,” he says, holding up a tube connected to a special space toilet. “Simple as that.”
Peake is living on the International Space Station as part of a six-month mission for the European Space Agency.
Watch the full video above.