Finishing this book was a struggle. I had watched the movie first, as I had heard from multiple people that they would recommend that. Unfortunately this made the book a difficult read because there were no surprises anymore. Although the book made me appreciate the movie even more, so that's a plus. I think my recommendation is to only watch the movie and don't bother with the book. Unless, of course, you're really into the detailed science-wankery, then the book is for you. Me, I enjoyed it for a while but it got old and started to smell. Watching Whatney "science the shit out of this", by the way, a great line the movie added, fitting his character, was a gimmick and not something that could carry an entire book. Another problem I had with the book was that Whatney didn't feel like a human being. He was more like a plot device so the author could throw around a lot of science. I guess that's another reason why I liked the movie better. Seeing him helped to convince me that he's human.