NASA scientists nicknamed it “frozen smoke” because aerogel is 99.8 percent air, and almost as light. Yet, "it is capable of insulating against extreme temperatures, filtering polluted water and absorbing pollutants such as crude oil… A mountaineer climbing Everest using boots insulated with aerogel said: "The only problem I had was that my feet were too hot, which is a great problem to have." (London Times)

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