Enjoyed reading this. Fun, sometimes humorous and very page-turning stuff and, no little green men! Tells the slightly future story of astronaut Mark Watney who gets left behind on a mission to Mars who has to use all of his scientific know-how to "MacGyver" his way through one deathly critical situation after another...from refitting his rovers, to powering up the abandoned Pathfinder to communicate with Earth, to growing potatoes, to using his urine to launch into the Martian atmosphere...all to survive a year and a half completely alone on Mars. I have no idea how realistic all his work-a-rounds were but they certainly seemed plausible and they were explained in an easy to understand way (and real astronaut Chris Hadfield did give the book a good review).