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One of the weirdest materials I have seen only recently is Aerogel. It's basically a gel that has had all the liquid removed to leave the solids in the same form as when it was a gel. it makes a structure that is 99.8% air, a superb insulator and very stong for it's weight. Apparently, it was invented in the 1930s but has now been refined enough to be useable by NASA. It just looks like solid smoke.
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