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The Lightest Solid on Earth (You won’t believe this exists)
Aerogel is the lightest and lowest-density solid in the world. It’s a gel composed of 99.8% air. Looking like frozen smoke, this material is almost as light as air itself. It’s only 1.74 grams. It’s so light that even soap bubbles can lift it. Despite its weight, it can withstand extreme temperatures from -273 degrees Celsius to 650 ...
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