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"Building one space station for everyone was and is insane: we should have built a dozen."
- Larry Niven

Levitating Path  
  Anti-gravity metal used to make a floating walkway.  

He indicated a metal path that struck off into green wilderness, over steaming swamp, among giant ferns and palms. "And that," he said, "is the Path, laid by Time Safari for your use. It floats six inches above the earth. Doesn't touch so much as one grass blade, flower or tree. It's an anti-gravity metal. Its purpose is to keep you from touching this world of the past in any way. Stay on the Path. Don't go off it. I repeat. Don't go off. For any reason! If you fall off, there's a penalty. And don't shoot any animal we don't okay."
From A Sound of Thunder, by Ray Bradbury.
Published by Collier's in 1952
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Thanks to Connor Lawrence for contributing this item.

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