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Near-perfect Sound Absorbing System

A team of researchers at Hong Kong University of Science and Technology have developed a sound-cancelling system that eliminates 99.7 percent of noise, no matter how quiet. The new system absorbs incoming sounds not once but twice using a pair of "impedance-matched" resonators. http://www.engadget.com/2015/09/14/researchers-create-a-near-perfect-sound-absorbing-system/ #tech

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