Previously, on The Trouble with Gerrold…

Science fiction is a unique kind of conversation. It’s not about what is, it’s about what might be. As a literature of the extraordinary, SF does three things well: it is prophetic, it is prophylactic, and it is prescriptive. It predicts the future, it warns against the future, and it suggests remedies for the future.

The computer, even before it was known as “the computer,” has almost always been imagined as the most powerful tool human beings could have. While all of our other tools have been about expanding muscle power, the computer is the only one that expands our brain power.

Expanding human intelligence and taking us to the next level of evolution has long been a staple of science fiction. As we saw in the beginning of this list, from the very beginning, speculative authors have been predicting, warning and attempting to cure the various possibilities of advanced computing technology.

Completing the list, here are the final 25 most memorable computers in science fiction.

Deep Thought. In “The Hitchhiker’s Guide To The Galaxy,” Douglas Adams mordantly hysterical radio series from 1978 (and eventually a series of books), Deep Thought is the ultimate computer built to answer the ultimate question of “Life, the Universe, and Everything.” Deep Thought constructs the Earth to work out the results. The answer is 42. Unfortunately, the question is “What is 6 x 9?”—which explains why the universe is so screwed up.

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