Peter and Rosemary Grant discuss how and why species multiply. The lecture is concluded with a panel discussion with Carol Boggs and Rodolfo Dirzo. Course Description "Light will be thrown..." With these modest words, Charles Darwin launched a sweeping new theory of life in his epic book, On the Origin of Species (1859). The theory opened eyes and minds around the world to a radical new understanding of the flora and fauna of the planet. Here, Darwin showed for the first time that no supernatural processes are necessary to explain the profusion of living beings on earth, that all organisms past and present are related in a historical branching pattern of descent, and that human beings fall into place quite naturally in the web of all life. Now, 150 years later and 200 years after Darwin's birth, we celebrate the amazingly productive vision and reach of his theory. In this Fall Quarter course, we will meet weekly with leading Darwin scholars from around the country to learn about Darwin's far-reaching legacy in fields as diverse as anthropology, religion, medicine, psychology, philosophy, literature, and biology. Editor's Note: The opinions and scholarly conclusions expressed in this course are solely those of the speakers that present them, and do not necessarily reflect the views of Stanford University or Academic Earth.