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Space is devoid of the stuff humans need to live: air, gravity, hot showers, fresh veg, privacy, beer. How much can a person give up? What happens when you can't walk for a year? Is sex any fun in zero gravity? What's it like being cooped up in a metal box with a few people for months at a time? As Mary Roach discovers, it's possible to explore space without ever leaving Earth. From the space shuttle training toilet to a 17,000 mile-per-hour crash test of NASA's space capsule (cadaver stepping in), she takes us on a surreally entertaining trip into the science of living in space.