http://stream.publicbroadcasting.net/production/mp3/wamc/local-wamc-524832.mp3
Albany, NY – Theories about what lies beneath the Earth's surface have been a part of many human civilizations throughout history, and David Standish's new book "Hollow Earth" explores the science and literature that have developed around the idea. Gretchen Holbrook Gerzina talks to Standish about the various explanations people have come up with about underground worlds.