Mark Joseph Young
Taking that to be Why I Believe, a family friend asked me a question that was going to take more than a minute to answer, so I started writing the answer for him. One thing I learned from fielding time travel questions by e-mail was that if one person asks something, someone else wants the answer, too, so if it's a complicated answer it's best to write it somewhere others can read it. So it became a published book.
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