Note: Essay starts: "One of the side effects of the growing respectability of science fiction was that it began to appear in markets where, a few short years earlier, the Sanitation Department would have been called in to remove any such manuscripts that had inadvertently found their way into the editorial office." Essay finishes: "Well, maybe they just had difficulty getting appropriate stories. I don't know." "First appearance – Scientific American, February 1962. ©, 1962, Hoffman Electronics Corporation."