Focusing Sound with Metasurfaces: A New Way to Reduce Noise and Power Devices?

Whether it's the neighbor's barking dogs, pounding rain, the din of traffic, or the music of your own choosing, most of us are constantly surrounded by noise. Noise is energy, so that means most of us are constantly surrounded by a relatively safe, renewable, and clean form of energy. What if we could harvest this energy?It seems like a match made in heaven--unwanted noise is everywhere and its levels are rapidly rising, as is our demand for power. Crunch the numbers on how long you'd have to ye...