The world's best thermometer isn't made of mercury; it's made of light. Physicists have created the most sensitive thermometer yet that's three times more precise than the best thermometers in existence today.
So how does this new thermometer work? It injects two colors of light, red and green, into a highly polished crystalline disk. The two colors travel at slightly different speeds in the crystal, depending on the temperature of the crystal. For example, when the researchers heat up the crystal, the re...
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