Phosphorus is an element that wears many faces. Its overuse as a fertilizer has polluted freshwater ecosystems, transforming rivers and lakes from thriving communities to lethal zones devoid of life. Its role as an explosive has brought fiery death and suffering to many during times of war. And its dwindling global supply poses an existential threat to humanity. Because phosphorus is not just a destructive force - it is essential for all of life on this planet. In The Devil’s Element: Phosphorus and a World Out of Balance, author Dan Egan explores the multi-faceted nature of phosphorus and the surprising ways this element has shaped our world. Egan, Journalist in Residence at the Center for Water Policy in the University of Wisconsin-Milwaukee's School of Freshwater Sciences, transports readers from the guano-covered islands off the coast of Peru to the fertile fields of the American Midwest, from the 17th century laboratories reeking of boiled urine to our tenuous future as the demand for this element outpaces its supply. Tune in to learn about this powerful yet underappreciated element.