The successful test launch and return of the Orion space capsule in late 2014 reminded me that I'd yet to read Mary Roach's 2010 book about all the behind-the-scenes work that goes into getting humans into space and (fingers crossed) to Mars one day. Keep in mind that sending probes and landers the many millions of miles to the red planet is certainly a feat of science an engineering, but it's almost trivial compared to the task of creating a spacecraft that can actually get humans there (and back, if they're lucky) in a way that leaves them both alive and sane. Roach describes the kinds of earthbound testing done on human research subjects to see who'll best be able to live for months in close quarters, dealing with exacting routines and massive amounts of boredom (hint: it's not the "Right Stuff" space-cowboy types). There's also an awful lot of discussion of discussion about various...er...personal hygiene issues, and even the requisite reflection upon space romance. What you quickly learn is that space travel will not be for those who expect to maintain a great deal of privacy and dignity. Roach's tone is often humorous, especially when she describes her own experiences in various testing/training tools, such as the "vomit comet" (the jet on which would-be astronauts first experience zero-gravity). She nicely focuses on the personalities of the people behind the projects, not just the science and technology. The has a lot of diversionary footnotes, which I found interesting and enjoyable, but that others might think bothersome. This is a quick, entertaining and enlightening read.