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"In science fiction one can say a great many things that are unpalatable, … because it's expressed as science fiction you can slip it past their defenses."
- Frederik Pohl
 |
| 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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'This was their world, their planet — this swift-traveling, yet seemingly moveless vessel.'
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Accompanied by a small selection of similar ideas from science fiction.
'...war-balloons, or, as it would be more correct to call them, navigable aerostats.'
