“Q. Your original, self-published version of The Martian became a phenomenon online. Were you expecting the overwhelmingly positive reception the book received? A. I had no idea it was going to do so well. The story had been available for free on my website for months, and I assumed anyone who wanted to read it had already read it. A few readers had requested I post a Kindle version because it’s easier to download that way. So I went ahead and did it, setting the price to the minimum Amazon would allow. As it sold more and more copies I just watched in awe.”