Today’s episode comes from Twenty Thousand Hertz, a podcast that reveals the stories behind the world's most recognizable and interesting sounds. On their show, they’ve explored topics like the sounds of other planets, the mind blowing ways that insects communicate, and secret spy messages that are broadcast on the radio.In this episode, they take you to the US-Canadian border, where, in 2011, residents of Windsor, Ontario started experiencing a strange rumbling hum that rattled dishes and kept people awake at night. Then, after years of getting nowhere, the mystery of the Windsor Hum was finally solved... Or was it?