"Knock" is a science fiction short story by American writer Fredric Brown. It is noted for beginning with a piece of flash fiction:
It then goes on to elaborate on these two sentences and build a more complete plot around them.
It was published in the December 1948 issue of Thrilling Wonder Stories.Index to Science Fiction Anthologies and Collections . Website of Locus - The Magazine of the Science Fiction & Fantasy Field. There have been three different radio adaptations (Dimension X, X Minus One and Sci Fi Channel's Seeing Ear Theatre). The story was reprinted in The Best Science Fiction Stories: 1949Everett F. Bieler & T. E. Dikty, eds., The Best Science Fiction Stories: 1949 New York: Frederick Fell, Aug. 1949, 314 pp.
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