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"The best fuzzy rules, the best knowledge, deal with the turning points of the system. If a race-car driver teaches you how to drive, you don't need him to show you how to drive on the straightaway. It's how he handles the curves that matters."
- Bart Kosko

Sun Goggles  
  Lenses darken in spots to block the brightness of alien suns.  

At that moment we went through the weather dome. CY Aquarii, which had been a soft white patch, became for an instant a tiny bright point of agony. Then a spot on each lens of my goggles turned black and covered the sun.
From Grendel, by Larry Niven.
Published by Ballantine in 1968
Additional resources -

Thanks to Winchell Chung for suggesting this item.

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Additional resources:
  More Ideas and Technology from Grendel
  More Ideas and Technology by Larry Niven
  Tech news articles related to Grendel
  Tech news articles related to works by Larry Niven

Sun Goggles-related news articles:
  - Electronic Sunglasses Designer Needs Your Help!

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