Phosphorus has played a critical role in some of the most lethal substances on earth: firebombs, rat poison, nerve gas. But it's also the key component of one of the most vital: fertilizer, which has sustained life for billions of people. In this major work of explanatory science and environmental journalism, Pulitzer Prize finalist Dan Egan investigates the past, present, and future of what has been called "the oil of our time." The story...