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US researchers create film with cool benefits.

US researchers have developed a metamaterial they say could be used to help cool buildings without the use of energy or water.
Thanks to a $3m grant awarded in 2015 by the US Energy Department’s Advanced Research Projects Agency-Energy (ARPA-E), engineers at the University of Colorado Boulder created a new kind of cooling film made of a glass-polymer hybrid under a layer of silver.
This metamaterial is supposed to cool...

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