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"To get anywhere, or even live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer."
- Robert Heinlein
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| Sunshades | ||
| Sunglasses that darken and lighten based on ambient lighting. |
| Red Wig walked tall, tiny beads of perspiration seasoning her upper lip, eyes hidden behind sunshades which had darkened themselves as much as they could. |
| Technovelgy from This Immortal,
by Roger Zelazny. Published by Ace Science Fiction in 1965 Additional resources -
|
Photochromic glass were developed by Corning in the early 1960's; they contain a layer of material that will darken when exposed to ultraviolet rays.
I still think that this use is a good example of how science fiction can promote a use for technology before it becomes generally available. Glasses that contained this material were not commercially available until the mid-1970's.
Compare this idea to the polawindows from Frank Herbert's 1972 novel The Godmakers.
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