For many decades, the proponents of `artificial intelligence'' have maintained that computers will soon be able to do everything that a human can do. In his bestselling work of popular science, Sir Roger Penrose takes us on a fascinating tour through the basic principles of physics, cosmology, mathematics, and philosophy to show that human thinking can never be emulated by a machine.Oxford Landmark Science books are ''must-read'' classics of modern science writing which have crystallized big ideas, and shaped the way we think.