"To live, our bodies must continuously shed materials. Stop urinating, stop defecating, stop expelling breath, and death is near. While we often think of these materials as embarrassing waste products, they serve far more complex functions. The color of our mucus, the volume of our flatus, the rhythm of our breath: taken together, these materials tell a story of the human that produced them. Moreover, the exchange, elimination, and frequent disguise of our effluence has been elemental to the development of human civilization, and our lives today are still governed by a host of laws and superstitions and social mores about the materials our bodies leave behind. In each of twelve discrete chapters, Earthly Materials tells a story about one of the materials the human body sheds--from breath and urine to vomit and tears. Sometimes the questions examined are historical: What have we physically done with all the urine produced in our cities? Sometimes they approach the matter through a philosophical lens: Is it ever logical to cry? Sometimes they explore recent scientific discoveries: How is mucus forcing us to reconsider our understanding of natural selection? But they always offer a window into how we negotiate our place in the world and how we get along with one another."-- Provided by publisher.