The 'Hum' Mystery: What is Behind Chthonic Noise That Ruins Lives of People Able to Hear It

Where does it come from? No one knows. What exactly does it sound like? No one is quite sure. Why are certain people able to hear it and others are not? Absolutely no idea. Meet "the Hum": an invasive noise anomaly that has been spotted, or rather heard, in different places across the world.