As subtle as a flying brick.

Aerogel

Aerogel – it holds six world records for physical properties and is nicknamed ‘blue smoke’ for its appearance; unsurprising since it is 99.8% air. Despite being used in the NASA Stardust and Mars Pathfinder missions, aerogels are not a recent invention and they were first prepared in 1931. It’s also a great insulator – here are some wonderful photos of it in action.

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