Aerogel: World's Lightest Solid.

Invented in 1930s, Aerogel is the world's lightest solid material. It is 99.8% air and is 1000-less dense than glass. An ounce of this material can cover an area of 10 football fields!

That's not its only amazing property: it has 39 times the insulation factor of fiberglass.

Link to Berkeley National Laboratory's Aerogel Website

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