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"My feeling is that the chance of our surviving into the twenty-first century as working civilization is less than fifty percent but greater than zero."
- Isaac Asimov

Thought-Screen  
  A device that prevents other people from taking over control of your thoughts and mind.  

"Therefore, with every faculty of his newly-enlarged mind concentrated upon the thought-screened, armored head behind the billowing gun and flaring projectors, Kinnison held his line and forged ahead..."

"Attentive as he was to Helmuth's thought-screen, the Patrolman was ready when it weakened slightly and a thought began to seep through, directed at that peculiar ball of force."

From Gray Lensman, by E.E. 'Doc' Smith.
Published by Astounding Science Fiction in 1942
Additional resources -

Here's another gripping quotation from Second Stage Lensman:

"The horrible parasitism went on for ages. The Velantians fought vainly; their crude thought-screens were almost useless until after the coming of the Patrol. Then, with thought-screens that were of real use, and with ships of power and with weapons of might, Worsel himself had taken the lead in the clean-up of Delgon."

Thanks to Alan Willard for contributing this item.

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Additional resources:
  More Ideas and Technology from Gray Lensman
  More Ideas and Technology by E.E. 'Doc' Smith
  Tech news articles related to Gray Lensman
  Tech news articles related to works by E.E. 'Doc' Smith

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