Cara is joined by the Charles Simonyi Professor for the Public Understanding of Science and Oxford Professor of Mathematics, Dr. Marcus Du Sautoy, to talk about his new book "The Great Unknown: Seven Journeys to the Frontiers of Science." They discuss his role as a professional science communicator, as well as his take on the very edges of modern science understanding, from chaos to consciousness to infinity. Follow Marcus: @MarcusduSautoy.