"Answer" - Fredric BrownSome sites called it one of the most famous science fiction stories, but I had never heard of either writer Fredric Brown or this story called "Answer". One of the advantages of working with the world of languages is that interesting texts pass by one's eyes. While reading a presentation on Named Entity Recognition, this story appeared on one of the early slides.
It is quite a wonderful story, and just about 260 words long. Read it.
Update: It turns out I have read Brown before. His fine story called "Arena" is in a (cherished) Reader's Digest collection of best short stories.