Harry Brake
Harry Brake asked Andy Weir:

Some points during the text, I felt overwhelmed with the details of Science, Biology, and the chemical reactions needed for simple survival. Yet, it subsided and all turned out perfect, riding it out as a reader it "jelled." Did you ever feel that too much detail in those areas would lose some readers if they did not come back from that particular background?

Andy Weir Yes, that was a constant concern. So I tried to tell the reader just enough for them to understand the problem and Mark's solution. It was a delicate balance.
Andy Weir
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