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"I can remember when the first pulsars were discovered. I was able to go and sit down and listen to graduate students talking about what their theories, to explain what pulsars really were."
- Vernor Vinge

Radiation Shield  
  A clever use for the water you need to take anyway.  

"You mean they bathed that ship in neutrons?"

"Shot it full of 'em. Just like our proton guns, only sending neutrons."

"Well, why weren't we killed too?"

"Water stops neutrons," Kendall said. "Figure it out."

"The rocket-water tanks - all around us... that saved us?"

Technovelgy from The Ultimate Weapon (Uncertainty), by John W. Campbell.
Published by Amazing Stories in 1936
Additional resources -

Compare to the ozone radiation shield in A Daring Trip to Mars (1932) by Max Valier and to water tank reaction mass from Marooned Off Vesta (1939) by Isaac Asimov.

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Additional resources:
  More Ideas and Technology from The Ultimate Weapon (Uncertainty)
  More Ideas and Technology by John W. Campbell
  Tech news articles related to The Ultimate Weapon (Uncertainty)
  Tech news articles related to works by John W. Campbell

Radiation Shield-related news articles:
  - NASA's New Radiation Shielding First Proposed By John W. Campbell In 1936
  - Active Electrostatic Radiation Shielding For Space Craft

Articles related to Space Tech
'If Anyone Is Watching Earth...'
Cloud Of Space Rubbish From China's Long March Rocket
ESA's Draco To Study Heat Of Reentry
The United States Space Academy Is Official

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Science Fiction in the News

'If Anyone Is Watching Earth...'
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'Within seconds the material was spread out over fifty yards, in a matter of hours it might occupy several cubic miles of space...'

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'...a synthetic which air-friction would erode.'

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'The sky is the limit' just got higher.

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