I remember watching a Ted talk about directional audio "Woody Norris: Hypersonic sound and other inventions" which focus's audio like a laser. https://www.yout

I remember watching a Ted talk about directional audio "Woody Norris: Hypersonic sound and other inventions" which focus's audio like a laser. https://www.youtube.com/watch?v=HF9G9M0cR0E https://www.youtube.com/watch?v=HF9G9M0cR0E - very interesting to watch.