BG Josh
BG Josh asked Andy Weir:

I was wondering about your writing process. Did you come up with cool problems (and solutions) and then write the story to include these situations? Or did you write the story and figured solutions to match the problems that arose?

Andy Weir I came up with the problems first, then worked out the solutions. I tried to make each new problem come about as a result of Mark's solution to the previous problem.
Andy Weir
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