"Fantasies are things that can't happen, and science fiction is about things that can happen."

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Writing fiction is like music. You have to keep it moving. You can have slow movements but there has to be a sense of momentum, of going someplace. You hear a snatch of Beethoven and it has a sense of momentum that is unmistakably his. That's a nice quality if you can do it in fiction.

— John Updike