Wikipedia:Picture of the day/June 27, 2005
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A piece of Aerogel supporting a 2.5 kg brick. Aerogel is a silicon-based substance and the world's lowest-density solid. It is composed of 99.8% air and is a stiff foam with a typical density of 3 mg per cm3. Aerogel holds 15 records for material properties, including best insulator and lowest-density solid. Aerogel can support 2000 times its own weight without collapsing. Photo credit: NASA |