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World's Lightest Solid!

Adults Construction Media Science Physics Space

Aerogels are the world's lightest (least dense) solids. They are also excellent thermal insulators and have been used in numerous Mars missions and the Stardust comet particle-return mission.

Why Are 96,000,000 Black Balls on This Reservoir?

Adults Construction Design Science Environment Nature Society

I took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they're there.