Frozen smoke (read: aerogel) -- not to be confused with the stuff your Grandma uses to flavor her turkey -- is the world's lightest material, and it just keeps getting lighter.
Researchers at the University of Florida have created a new form of the super material, known as multi-walled carbon nanotube (MWCNT) aerogel, that has a density of just four milligrams per cubic centimeter and can be used in sensors to detect pollutants and toxic substanc
Source:
http://www.engadget.com/2011/01/16/carbon-nanotube-aerogel-now-the-worlds-lightest-material/
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