Matt asked Andy Weir:

Hi Andy, I thoroughly enjoyed your book. How authentic is the tech you wrote about - I mean, it all sounded quite plausible and theoretically possible (from a non scientific / engineering background).. But is it? Thanks - keep up the good work! Matt

How much research did you do to prepare for writing The Martian? Did you ever have to "stretch the facts"?

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Elle asked Andy Weir:

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