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"It was [H.G. Wells'] adolescent fiction, his imaginative stories, that live forever - and yet are not acknowledged in literature classes as being great literature. So to hell with the academics!"
- Greg Bear

Scrith  
  The material used to build Ringworld; has remarkable tensile strength  

In this excerpt from the novel, Louis Wu is discussing a puzzling discovery.

"Our telescopes cannot find further details."

"So you haven't really learned much."

"I would say that we have learned a good deal. One puzzling point. The ring apparently stops on the close order of 40 percent of neutrinos."

From Ringworld, by Larry Niven.
Published by Ballantine in 1970
Additional resources -

Scrith has another interesting property, revealed when a spaceship plowed a furrow in the scrith forming the foundation of the Ringworld:

His feet shot out from under him the moment they touched ground. He landed hard on his gluteus maximi.

The flat, grayish, translucent material beneath the ship was terribly slippery...

"...Watch out when you get down. The surface is almost frictionless."

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Additional resources:
  More Ideas and Technology from Ringworld
  More Ideas and Technology by Larry Niven
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