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BadEngineering ,

It would allow engineers to create glass panes for windows that not just darken on demand, but selectively filter certain wave lengths of light. The windows could filter out infrared light while allowing visible light through, which would keep buildings cooler without eliminating natural light. The compound, tungsten oxide hydrate, can can selectively absorb different wave lengths of light depending on the current and amount of lithium ions applied to the material.

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