You can even hear the interference between two sine waves, without them actually "mixing" in the air, by feeding one to each ear. This doesn't work for every fr

You can even hear the interference between two sine waves, without them actually "mixing" in the air, by feeding one to each ear. This doesn't work for every frequency, but when it does it sounds the same as it would if they were both played to both years, but it's happening in your brain! https://en.wikipedia.org/wiki/Beat_(acoustics)#Binaural_beats https://en.wikipedia.org/wiki/Beat_(acoustics)#Binaural_beat...