Thinking Sideways Podcast

Strange round stones are being found in a mine in South Africa, they typically have 1 to 3 ridges around their circumference and predate the material surrounding them. Some say natural phenomena, out of place artifacts, or a sign that another form of intelligent life put them here. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.