Space is a world devoid of the things we need to live and thrive: air, gravity, hot showers, fresh produce, privacy, beer. How much can a person give up? How much weirdness can they take? What happens to you when you can't walk for a year? What happens if you vomit in your helmet during a spacewalk? Is it possible for the human body to survive a bailout at 4,000 miles per hour? To answer these questions, space agencies set up all manner of quizzical and startlingly bizarre space simulations -- making it possible to preview space without ever leaving Earth. From the space shuttle training toilet to a crash test of NASA's new space capsule (cadaver filling in for astronaut), Packing for Mars takes us on a surreally entertaining trip into the science of life in space and space on Earth.