** Isaac Asimov's "The Last Question" (short story, science fiction)

An AI is given a rather fundamental problem - figure out a way to reverse entropy without expending energy! Very entertaining.

Collected in.

1. David Hartwell & Kathryn Cramer (Ed)'s "The Ascent of Wonder: The Evolution of Hard SF".
2. David Drake, Jim Baen, & Eric Flint (Ed)'s "The World Turned Upside Down".

Fact sheet.

First published: Science Fiction Quarterly, November, 1956.
Rating: A
Download full text.

Note: Why is this post so short?