SmartGlass involves two panes sandwiching a film containing minuscule liquid droplets of these light-absorbing polyiodide crystals.

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Water is much more efficient than air at absorbing heat and so even with tiny amounts of liquid flowing through the system the researchers saw a significant effect.

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At room temperature, the nuclei in a liquid are perpetually jostling back and forth between up and down, emitting and absorbing radio waves, with only a slight preference for up.

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