"To that extent, I think that science fiction, even the corniest of it, even the most outlandish of it, no matter how badly it's written, has a distint therapeutic value because all of it has as its primary postulate that the world does change. I cannot overemphasize the importance of that idea. Unless you believe that, unless you are prepared for it—as I know all of you are—you can't retain your sanity these days."

— Robert A. Heinlein