Aristotle’s Physics is the only complete and coherent book we have from the ancient world in which a thinker of the first rank seeks to say something about nature as a whole. Yet existing translations of Aristotle’s Physics have made it difficult to understand either Aristotle’s originality or the lasting value of his work. In this volume Joe Sachs provides a new, plain-spoken English translation of all of Aristotle’s classic treatise and accompanies it with a long interpretive introduction, a running explication of the text, and a helpful glossary. He succeeds brilliantly in fulfilling the aim of this innovative series: to give the general reader the tools to read and understand a masterwork of scientific discovery.