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 cant walk? Is sex any fun? Whats it like being with a few people for months at a time? From the space shuttle training toilet to a 17 000 mile-per-hour crash test of NASAs space capsule Mary Roach takes us on a surreally entertaining trip into the science of life in space.