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'Meta-mirror' reflects sound waves in any direction

Researchers have constructed a 'meta-mirror' device capable of perfectly reflecting sound waves in any direction. The proof-of-principle demonstration is analogous to looking directly into a mirror and only seeing the person next to you instead of your own face.

from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190307131433.htm
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