Windows

Glass “made from niobium oxide, which darkens when exposed to current,” and coated with “nanoscale crystals of indium tin oxide” which absorb heat-producing radiation when exposed to current, allows electrical control of the light and heat transparency of windows. (http://www.nature.com/news/smart-glass-blocks-heat-or-light-at-flick-of-a-switch-1.13558)

Electrified windows won’t have a fingerprint problem either.

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