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A New Ringlike Structure That Blocks Most Sounds Could Lead To Quiet Drones
Geo Beats
2019-03-13
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Scientists at Boston University have created an “open, ring-like structure” that can block 94% sound without interrupting air flow.
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<iframe width="600" height="350" src="https://dailytv.net//embed/x743it4" frameborder="0" allowfullscreen></iframe>
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