Why is the world the way it is? How did we get here? Does everything happen for a reason or are some things left to chance? Philosophers and theologians have pondered these questions for millennia, but startling scientific discoveries over the past half-century are revealing that we live in a world driven by chance. In this talk, Sean B Carroll tells the story of the awesome power of chance and how it is the surprising source of all the beauty and diversity in the living world.