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"A good science fiction story should be able to predict not the automobile but the traffic jam."
- Frederik Pohl

Palm Flower  
  It's like a life clock.  

"Show me your hand, Logan," said the psyc doctor.

Logan obeyed.

"Do you know why you have this?" he said, tapping the palmflower with an index finger.

"To tell my age," said Logan.

"And how old are you?"

"I'm six."

And what happens when you are seven?"

"It goes to blue... and I leave the nursery."

From Logan's Run, by William Nolan (w/G.C. Johnson).
Published by Unknown in 1967
Additional resources -

Compare to the cardioplate from Harlan Ellison's 1965 novel Repent Harlequin, Said the TickTockMan.

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Additional resources:
  More Ideas and Technology from Logan's Run
  More Ideas and Technology by William Nolan (w/G.C. Johnson)
  Tech news articles related to Logan's Run
  Tech news articles related to works by William Nolan (w/G.C. Johnson)

Palm Flower-related news articles:
  - Crystal Palm Flower: Logan's Run Life Clock on Ebay
  - Death Algorithm Developed In Japan
  - Tattoo Biosensor Warns Athletes Of 'The Wall'

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