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The interface between two facets of an artificial material known as a “Weyl phononic crystal” can not only negatively refract an airborne sound wave, it does so without reflecting it at all. This ...

Reverberant sounds made in an empty environment are the result of sound waves bouncing off hard, flat surfaces, as governed by basic principles of the science of physical acoustics. When completed, ...

Hey all! So all my life I have heard that sound is a type of wave. This seemed to make sense to me. Recently I have come across some information that has me second guessing such tradition knowledge.