Britain's most famous mathematician takes us to the edge of knowledge to show us what we cannot know. Science is king. Every week, headlines announce new breakthroughs in our understanding of the universe, new technologies that will transform our environment, new medical advances that will extend our lives. Science is giving us unprecedented insight into some of the big questions that have challenged humanity ever since we've been able to formulate those questions. Where did we come from? What is the ultimate destiny of the universe? What are the building blocks of the physical world? What is consciousness? 'What We Cannot Know' asks us to rein in this unbridled enthusiasm for the power of science. Marcus Du Sautoy explores the limits of human knowledge, to probe whether there is anything we truly cannot know. Are there limits to what we can discover about our physical universe? Are some regions of the future beyond the predictive powers of science and mathematics? Is time before the big bang a no go arena? Are there ideas so complex that they are beyond the conception of our finite human brains? Can brains even investigate themselves or does the analysis enter an infinite loop from which it is impossible to rescue itself? Are there true statements that can never be proved true? Prepare to be taken to the edge of knowledge to find out what we cannot know. Gold title * Marcus is one of Britain's leading mathematicians * Marcus du Sautoy has a high media profile and is a regular commentator on Radio 4, as well as presenting 'Mind Games' on BBC4 * In October 2008 it was announced that Marcus du Sautoy has been appointed to Oxford University's prestigious professorship as the Simonyi Chair for the Public Understanding of Science, a post previously held by Richard Dawkins * 'Music of the Primes', which has sold 40,000 copies, was a TV series on BBC 4.