[FRIAM] very cool stuff

[Roger Critchlow]

  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.

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