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"Science fiction is really sociological studies of the future, things that the writer believes are going to happen by putting two and two together."
- Ray Bradbury

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

Articles related to Space Tech
Is China Mining Helium-3 On The Moon's Farside?
Solitary Black Hole Wanders In Space
Spaceplane From Virgin Atlantic
Taikonauts Exercise In China's Tiangong Space Station

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Science Fiction in the News

LLM 'Cognitive Core' Now Evolving
'Their only check on the growth and development of Vulcan 3 lay in two clues: the amount of rock thrown up to the surface... and the amount of the raw materials and tools and parts which the computer requested.'

Has Elon Musk Given Up On Mars?
'There ain't no such thing as a free lunch.'

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'I guess there's nobody round this table who doesn't have a Crosswell [tapeworm] working for him in the small intestine.'

When Your Child's Best Friend Is An AI
'Figments of his mind in one sense, of course, for he had shaped them...'

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'So the parent drone carries a spotter that it launches...'

Drones Recharge In Mid-Air Like Jets Refuel!
'...nurse drones that would cruise around dumping large amounts of power into randomly selected pods.'

Australian Authors Reject AI Training Of Llama
'It's done with a flip of the third joint of the tentacle on the down beat.'

Is China Mining Helium-3 On The Moon's Farside?
'...for months Grantline bores had dug into the cliff.'

Maybe It's Too Soon To Require Autonomous Mode
'I hope all those other cars are on automatic,' he said anxiously.

Is Agentic AI The Wrong Kind Of Smartness?
'It’s smart enough to go wrong in very complicated ways, but not smart enough to help us find out what’s wrong.'

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