I had actually read the book a month or two before seeing the movie, so when I came out of the movie with the urge to read for more details, I went with Mary Roach's Packing for the Void (which I had bought a year before and forgotten to read while I was going through all the books Roach had published since last I looked into her work.) But the Martian book is excellent -- more details on what exactly the guy was doing and why.
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