Aerogel , also known as Frozen smoke , is the world's lowest density solid , composed of 96% air.
If you hold a small piece of Aerogel in your hand , its practically impossible to either see or feel.
But if you poke it , its like styrofoam.
It supports upto 4,000 times its own weight and can withstand a direct blast from two pounds of dynamite.
It is also the best insulator in existence.
Aerogel was used by NASA to help insulate the electronics on the Mars Exploration Rovers.
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