Since the late 20th century, a mysterious hum has been recognized by people all over the earth. In the first episode, we explored the Windsor Hum, a mysterious acoustic phenomenon that was heard from Windsor, Ontario in Canada. But underneath all sorts of localized sound phenomenons like this, is a hum that we think goes back, though unrecognized, for perhaps all of human history. Today we’ll speak with Dr Glen MacPherson about the mysterious World Hum. See the World Hum map at https://thehum.info