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"Why does a creative person create? It's a type of compulsion. I like to explore new ideas."
- Bart Kosko

Tin Foil Hat (Metal Foil Caps)  
  A metal device that protects the user from unwanted telepathic intrusions.  

This is apparently the genesis of the "tin foil hat" idea!

"...we should give our experimental squad the suggestion to broadcast 'sleep for a week.' The telepathic message would be relayed to each of the thousands of minds waiting receptively for it, and would take root in them, until the whole nation became a single super-consciousness, conscious only of the one thought 'sleep' which we had thrown into it."

The reader will perhaps ask how we ourselves expected to escape from the clutches of the superconsciousness we had created. Well, we had discovered that metal was relatively impervious to the telepathic effect, and had prepared for ourselves a sort of tin pulpit, behind which we could stand while conducting experiments. This, combined with caps of metal foil, enormously reduced the effects on ourselves.

Technovelgy from The Tissue-Culture King, by Julian Huxley.
Published by Amazing Stories in 1927
Additional resources -

In the story, the protagonists develop a remarkable facility for mass hypnosis through telepathy:

He saw himself, through this mental machinery, planting such ideas as he wished in the brain-cases of his people. He saw himself willing an order; and the whole population rousing itself out of trance to execute it. He dreamt dreams before which those of the proprietor of a newspaper syndicate, even those of a director of propaganda in wartime, would be pale and timid.

Huxley also refers to his tin foil hats as "our metal headgear, or mind-protectors".

Compare to the thought screen helmet from Gray Lensman (1942) by E.E. 'Doc' Smith and the probe screen hood from The Hood Maker ('Immunity') (1955) by Philip K. Dick.

Thanks to @SFFaudio for sending me this reference.

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Additional resources:
  More Ideas and Technology from The Tissue-Culture King
  More Ideas and Technology by Julian Huxley
  Tech news articles related to The Tissue-Culture King
  Tech news articles related to works by Julian Huxley

Tin Foil Hat (Metal Foil Caps)-related news articles:
  - Thought-Screen Helmets A Classic American Craft
  - Who First Thought Of A Tin Foil Hat?

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