Are physicists on the verge of discovering a giant mathematical structure that encompasses all the deepest laws of nature? One of the world's leading theoreticians, Nima Arkani-Hamed, thinks so. In this event, he talks with the writer and physicist Graham Farmelo, author of the new book "The Universe Speaks in Numbers," which explores the miraculous harmonies between mathematics and fundamental physics. Arkani-Hamed and Farmelo will discuss - in non-technical terms - the development of our understanding of nature, from Newton to string theory and beyond. This talk is free and open to the public.