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Aerogel
Pity this stuff is so brittle, it could make an interesting blank material.

At that kind of compressive strength, foot dents would be a thing of the past but there would never be any reactive flex.



www.cracked.com/article_17476_7-man-made-substances-that-laugh-in-face-physics.html

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QUEST Lab: Aerogel - KQED QUEST

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