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"Real science opens windows for us to look through. We're right at the footsteps of the most interesting scientists around."
- Larry Niven

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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