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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Hush Hood  
  A device that cancels noise, ensuring that others cannot overhear.  

"...Where is he?"

"A public phone in a taproom called The Iceman's Wife underneath the -"

"I know, Mike, when you switch me in, can you stay in circuit? Want you to monitor."

"It shall be done."

Can you tell if anyone is in earshot? Hear breathing?"

"I infer from the anechoic quality of his voice that he is speaking under a hush hood..."

From The Moon is a Harsh Mistress, by Robert Heinlein.
Published by GP Putnam in 1966
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