[silvajoao]

The Last Question is perhaps the short story with the most mind-bending finale. Highly recommended.

http://www.multivax.com/last_question.html

[nazgulnarsil]

I prefer the last answer.

[kilian]

I found both to be some of the most rewarding stories I read. With both, upon finishing them, I spent another hour just thinking about it. Highly recommended!