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"This is a predictive tool I've used: There are goals we've sought for ten thousand years, and we'll go on seeking them. Instant transport and travel, immortality (or at least longevity and miracle cures.), instant learning "
- Larry Niven

Inter-Universal Messenger  
  A device intended to travel to another dimension.  

As it eventually worked out, the inter-universal messenger had to be constructed from the sub-microscopic level on up out of fundamental nuclear particles which came as close to being nothing at all as either universe would ever be likely to provide: zero-spin particles with various charges and masses, and neutrino/anti-neutrino pairs. Even detecting that the object was present at all after it had been built was an almost impossible task, for neutrinos and anti-neutrinos have no mass and no charge, consisting instead partly of spin, partly of energy of translation; it did no good to try to visualize such particles since like all the fundamental particles they were entirely outside of experience in the macroscopic world. Matter was so completely transparent to them that stopping an average neutrino in flight would require a lead barrier fifty light years thick.
Technovelgy from Cities in Flight, by James Blish.
Published by Avon in 1957
Additional resources -

Cities in Flight is a set of novels; this item is taken from The Triumph of Time.

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Additional resources:
  More Ideas and Technology from Cities in Flight
  More Ideas and Technology by James Blish
  Tech news articles related to Cities in Flight
  Tech news articles related to works by James Blish

Inter-Universal Messenger-related news articles:
  - AMANDA May Find Probes To Other Dimensions

Articles related to Space Tech
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Gigantic Space Sunshade Would Fight Global Warming
Untethered Spacewalk's 50th Anniversary
ESA Designs Huge Inflatable Moonbase

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'Yes, strangely enough there was still sufficient water beneath the surface of Vesta.'

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'When confronted by hills, or rough terrain, it did not stop, but simply slowed until the task demanded equaled its steady power output.'

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'...the light of the sun had been polarized by two crossed fields so that no radiation could pass.'

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'But that space walk of mine wasn't so very amazing.'

ESA Designs Huge Inflatable Moonbase
'It was like being inside a balloon; indeed, that was exactly where he was.'

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'...a simple clock-set servok with pipe and hose arms.'

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