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The most effective way to block an annoying sound is to simply build a barrier — the thicker, the better. But instead of everyone living in sound-blocking caves in a few years as noisy drones criss-cross the skies, researchers at Boston University have engineered an acoustic meta material that’s designed to silence annoying sounds at their source, without blocking the movement of air.

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01.01.1970 (18564 days ago)
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