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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

'Fresher  
  Short for 'refreshing chamber', a device that performs various personal services.  

Gilead threw off his clothes and stepped into the 'fresher. Twenty minutes later, shaved from ear to toe, scrubbed, soaked, sprayed, pummeled, rubbed, scented, powdered, and feeling ten years younger, he stepped out.
From Gulf, by Robert Heinlein.
Published by Astounding Science Fiction in 1949
Additional resources -

See also refreshing chamber, an earlier and simpler version from Heinlein's 1940 novella Coventry.

Thanks to an anonymous reader for pointing this reference out.

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