Aerogel is nicknamed “frozen smoke” and is made by extracting water from a silica gel, then replacing it with gas such as carbon dioxide. The result is a substance that is capable of insulating against extreme temperatures and of absorbing pollutants such as crude oil.
It was invented by an American chemist for a bet in 1931, but early versions were so brittle and costly that it was largely consigned to laboratories. It was not until a decade ago that NASA started taking an interest in the substance and putting it to a more practical use.
I read something about this a few years ago, but it seems to be making headlines again.
