Roger Penrose 
Emperor’s New Mind [PDF ebook] 
Concerning Computers, Minds, and the Laws of Physics

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.