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"...science fiction is sort of like a sociological genome. It's a huge range of possible futures, most of them useless; some vital. You never really know in advance."
- Peter Watts

Radioactive Coding for Checks  
  Special coding system to easily recognize checks.  

One real improvement I had not appreciated up to then was the universal checkbook system; with a single cybernet as clearinghouse for the whole city and radioactive coding on my checkbook, I got cash laid in my palm as quickly there as I could have gotten it at my home bank across from Hired Girl, Inc.
Technovelgy from The Door Into Summer, by Robert Heinlein.
Published by Fantasy & Science Fiction in 1956
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Additional resources:
  More Ideas and Technology from The Door Into Summer
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to The Door Into Summer
  Tech news articles related to works by Robert Heinlein

Radioactive Coding for Checks-related news articles:
  - Marie Curie's Papers Still Radioactive

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Science Fiction in the News

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'The car faltered as the external command came to brake...'

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Congress Considers Automatic Emergency Braking, One Hundred Years Too Late
'The greatest problem of all was the elimination of the human element of braking together with its inevitable time lag.'

The Desert Ship Sailed In Imagination
'Across the ancient sea floor a dozen tall, blue-sailed Martian sand ships floated, like blue smoke.'

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There are no orbiting Michelin stars. Yet.

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'Power could be compressed thus into an inch-square cube of what looked like blue-white ice'

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