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+--- Thread: The lightest metal ever is 99.9% air (/thread-1454.html)
The lightest metal ever is 99.9% air - C C - Oct 17, 2015
http://www.treehugger.com/clean-technology/lightest-metal-ever-999-air.html
EXCERPT: Boeing has developed what they are calling the lightest metal ever and it's 99.9 percent air. The material called Microlattice appears solid from the outside, but inside it actually has an open cellular structure similar to bone or honeycombs, which allows it to be both super durable and lightweight. The material will soon be used by Boeing in airplanes and rockets...