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This is Scientific American's 60-Second Science. I'm Wayt Gibbs. Got a minute?

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When you brushed your teeth this morning, the image starting back at you from your bathroom mirror was imperfect.

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Now, I'm sure you're a lovely person.

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It's just that there is no such thing as a perfect mirror.

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Even the shiniest surface absorbs or transmits at least a tiny bit of the light that hits it.

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Or so it was thought until recently, when Chia Wei Hsu and his colleagues at M.I.T.reported in Nature that they created a virtually perfect mirror.

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It's made from the stuff of microchips: silicon, a layer of silicon dioxide, and on top a very thin film of silicon nitride,

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which is perforated by a grid of microscopic circular holes.

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When light hits that sieve-like surface at the just the right angle about 35 degrees,

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the quantum wave functions that govern the light interfere in such a way that there is no viable path for the photons other than to bounce off.

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So that's what they do.

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This phenomenon should work for all kinds of waves, not just light, but also sound and even water waves.

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But the most obvious application is to make more efficient and powerful lasers.

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Dr. Evil, are you listening?

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Wayt Gibbs.

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