1st Unnamed Cave was discovered in East Tennessee in 1994. The location is kept secret because what is there is sacred and vulnerable: Glyphs that are carved into the mud of the cave’s walls and ceiling. WUOT's Chrissy Keuper will speak with University of Tennessee Anthropology professor and archaeologist Dr. Jan Simek of the University of Tennessee Department of Anthropology about his book, A Dark Pathway: Precontact Native American Mud Glyphs from 1st Unnamed Cave, Tennessee, published by University of Tennessee Press.