http://science.sciencemag.org/content/355/6329/1062.full
reports construction of a metamaterial which is reflective at visible wavelengths and transparent at infrared wavelengths. As a consequence, it can form a roof which provides shade from the sun while passively cooling the shaded area by IR radiation into space. It has some aspects of Maxwell's demon, but it's distinguishing photos by their energy content, sun temperature photons are repelled, room temperature photons are allowed to pass. I don't understand the details of the construction as yet. -- rec --
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