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"At its best, SF is the medium in which our miserable certainty that tomorrow will be different from today in ways we can't predict, can be transmuted to a sense of excitement and anticipation, occasionally evolving into awe."
- John Brunner

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

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'The pitiless M rays pierced Earth and steel and densest concrete as if they were so much transparent glass...'

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'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'

Optimus Robot Will Be A Good Nanny, Says Musk
'Nanny is different,' Tom Fields murmured... 'she's not like a machine. She's like a person.'

ESA To Build Moon Bases Brick By Printed LEGO Brick
'We made a crude , small cell and were delighted - and, I admit, somewhat surprised - to find it worked.'

Does The Shortage Of Human Inputs Limit AI Development?
'...we've promised him a generous pension from the royalties.'

Textiles That Harvest Energy And Store It
'The clothes and jewelery drew their tiny power requirements from her movements.'

LORIS Passive-Gripper Climbing Robot
'At the end of each appendage's eight fingers there are tinier appendages...'

Drug To Regenerate Teeth In Humans
'We want to do something to help those who are suffering from tooth loss or absence,' said lead researcher Katsu Takahashi.

Coin-Sized Nuclear Battery Good For 100 Years
'...power pack the size of a pea.'

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