Did you make any of the science in the book up? As in, he really couldn't make water but you let it pass anyway so that the story would be better?

Andy Weir Nope, I used real science and did all the math. He really could make water that way. See this question for more info: https://www.goodreads.com/questions/2...

In what part of the story - if any - were you tempted to "stretch the scientific truth" to make it more interesting but didn't?

Scott asked Andy Weir:

Laura Emery asked Andy Weir:

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