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In less than the time it takes a beam of light to travel a tenth of a millimeter, vanadium dioxide can switch from a transparent to a reflective, mirror-like state.
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VS.
Quote:
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"Phase transitions in solids generally occur at the speed of sound in the material, but vanadium dioxide makes the switch 10 times faster. So far no one has succeeded in coming up with an excuse that allows it to occur with this kind of speed."
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Are these supposed to be the same speed, or length of time?
