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"You have to budget the number of fuzzy rules you use to control a system. It turns out, you can state the optimality principle in three words: 'patch the bumps.'"
- Bart Kosko

Parallel Universe  
  An entirely separate realm or universe that exists along with our own; it may be wildly different or vary from ours by only a tiny degree.  

This is a very early instance of this term in sf; possibly a first reference.

We conceive ourselves to be living in a parallel universe to yours, on a planet the very brother of your own.
Technovelgy from Men Like Gods, by H.G. Wells.
Published by Macmillan in 1923
Additional resources -

The notion of a separate world, or plane of existence, or realm, has existed in the human imagination from time immemorial. The classical Greeks used the ideas of Mount Olympus and Hades' underworld as different realms that existed along with our own; the ancient Hindus used the idea of a multiplicity of realms called "lokas".

Wells also described this idea in 1896 in The Plattner Story:

To put the thing in technical language, the curious inversion of Plattner's right and left sides is proof that he has moved out of our space into what is called the Fourth Dimension, and that he has returned again to our world.

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Additional resources:
  More Ideas and Technology from Men Like Gods
  More Ideas and Technology by H.G. Wells
  Tech news articles related to Men Like Gods
  Tech news articles related to works by H.G. Wells

Parallel Universe-related news articles:
  - Have Scientists Found A Parallel Universe Leaking Into Ours

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Science Fiction in the News

Brin's 1990 Novel Earth Still Full Of Predictions
'... making the point that their likenesses, every move they made, were being transmitted.'

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'But the stars are only atoms in larger space, and in that larger space the star-atoms could combine to form living matter, thinking matter, couldn't they?'

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'...to build up a video picture would require, say, ten million decisions every second. Mike, you're so fast I can't even think about it. But you aren't that fast.'

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'The area affected was five hundred kilometres across, and perfectly circular.'

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'Call 'em Winter Mute," said the other, making it two words.'

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'Hasan always pitched a Gauzy - a one-molecule-layer tent, opaque, feather-light, and very tough.'

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'And he had been sent with troops, supplies and bombs to command Russia's most trusted post, the Moonbase.'

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'What is your population', I asked. 'About eighty millions.'

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