All around us, the natural world goes through cycles of growth and decay. Fungi, including molds, are crucial to these life cycles and can be both destructive and beneficial to humans. From the cultivation of mushrooms, through the molds employed to make cheeses and other food products, to water-damaged human environments where mold must be contained, this book explores these organisms that exist largely unseen all around us. This big-picture approach demonstrates how fungi differ from other organisms, how they affect the world, and their crucial role in our ecosystem.