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"I received a nice letter the other day from the Dalai Lama. He had read 'The Nine Billion Names of God'. It is about a computer at a Tibetan monastery."
- Arthur C. Clarke

Zero-G Ashtray  
  An ashtray designed for use on a space station.  

He saw what a weight-free ashtray necessarily should be: a long tube with a bell-shaped receptacle on its end. A slight suction in the tube, and ashes knocked into the bell were swept away, out of sight and mind.
From Waldo, by Robert Heinlein.
Published by Astounding Science Fiction in 1942
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