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"The answer to the problem of information overload on the Net is reputations… engineer a system called a reputation server."
- Neal Stephenson

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
The New Habitable Zones Include Asimov's Ribbon Worlds
Will Space Stations Have Large Interior Spaces Again?
Reflect Orbital Offers 'Sunlight on Demand' And Light Pollution
Chrysalis Generation Ship to Alpha Centauri

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Science Fiction in the News

The New Habitable Zones Include Asimov's Ribbon Worlds
'...there's a narrow belt where the climate is moderate.'

3D Printing A 12-Meter Boat Hull
'It makes drawings in the air...'

China Still Working On Rescue Robot That Eats People
Firefighter Rescue Robot Eats Humans - again!

Lawyer AIs Create Chaos In Our Legal System
'I want my lawyer program.'

Chinese Hospital Tries Vonnegut's 'Harrison Bergeron' Cosplay
'He wore spectacles with thick wavy lenses. The spectacles were intended to make him not only half blind, but to give him whanging headaches besides.'

Robot Clerks Become A Reality In China
'The robot clerk in the waiting-room checked her number...'

Can One Robot Do Many Tasks?
'... with the Master-operator all you have to do is push one! A remarkable achievement!'

Atlas Robot Makes Uncomfortable Movements
'Not like me. A T-1000, advanced prototype. A mimetic poly-alloy. Liquid metal.'

Boring Company Drills Asimov's Single Vehicle Tunnels
'It was riddled with holes that were the mouths of tunnels.'

Humanoid Robots Tickle The Ivories
'The massive feet working the pedals, arms and hands flashing and glinting...'

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