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"Chinese scientists say they have developed the world's lightest material, lighter than air, which could play an important role in tackling pollution."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2013/03/22/Worlds-lightest-material-created/UPI-81041364005475/?spt=hs&or=sn>