The last question was asked for the first time, half in jest, on May 21, 2061, at a time when humanity first stepped into the light. The question came about as a result of a five dollar bet over highballs, and it happened this way ...

(From Goodreads)

ISBN: 1884214495

ISBN-13: 9781884214493

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I quote The Last Question all of the time. I loved it as a kid.