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"I realized there was a heavy-duty change coming in biology, and I could write a really compelling novel about catastrophic evolution, punctuated equilibrium."
- Greg Bear

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."

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

The implanted palm flower changes color every seven years; yellow (age 0–6), then blue (age 7–13), then red (age 14–20), then blinks red and black on Lastday, and finally turns black at age 21 - state-mandated death.

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'
  - Chromat Misfit Shine Tracks Health And Glows

Articles related to Culture
Robot Preachers Found To Undermine Religious Commitment
Gaia - Why Stop With Just The Earth?
Splendid View Of Eclipse From Orbit Visualized And Repurposed By Arthur C. Clarke
SensorWake Scent-Based Alarm Clock

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