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"...if you want to know what your future looks like, don't waste your time on Analog; read Time magazine. We are already saturated in the future. "
- Peter Watts

High-Frequency Oven  
  This describes the essence of a microwave.  

Heinlein didn't invent the idea of the microwave oven; Raytheon patented it in 1946 - see the entry for microwavable food for more details.

Theoretically every ration taken aboard a Patrol vessel is pre-cooked and ready for eating as soon as it is taken out of freeze and subjected to the number of seconds, plainly marked on the package, of high-frequency heating required.
From Space Cadet, by Robert Heinlein.
Published by Scribner's Sons in 1948
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