Isaac Asimov called “The Last Question” his favorite short story.
Why is it my favorite? For one thing I got the idea all at once and didn't have to fiddle with it; and I wrote it in white-heat and scarcely had to change a word. This sort of thing endears any story to any writer. Then, too, it has had the strangest effect on my readers. Frequently someone writes to ask me if I can give them the name of a story, which they think I may have written, and tell them where to find it. They don't remember the title but when they describe the story it is invariably 'The Last Question'. This has reached the point where I recently received a long-distance phone call from a desperate man who began, "Dr. Asimov, there's a story I think you wrote, whose title I can't remember—" at which point I interrupted to tell him it was 'The Last Question' and when I described the plot it proved to be indeed the story he was after. I left him convinced I could read minds at a distance of a thousand miles.
Mind Webs was a 1970's series out of WHA Radio in Wisconsin that featured weekly short stories of science fiction by some of the genre's best writers. The music, sound cues and occasional character voices along with the performance of Michael Hansen, the reader, resulted in better than most fully dramatized productions of the period. Around 150 shows were aired between 1976 and 1984 varying in length, but most were about 30 minutes.
Mind Webs: The Last Question - Isaac Asimov - 30:31