University of Sydney professor Peter Godfrey-Smith, author of the bestselling Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness, discusses how life on Earth has changed our planet, whether there might be life on other planets, and what the future of humanity could look like. Professor Godfrey-Smith's new book is Living on Earth: Forests, Corals, Consciousness, and the Making of the World.