Ren� Descartes is famous as the philosopher who was prepared to doubt everything- even his own physical existence. Most people know that he said 'I think, therefore I am', even if they are not always sure what he really meant by it. � Introducing Descartes explains what Descartes doubted, and why he is usually called the father of modern philosophy. It is a clear and accessible guide to all the puzzling questions he asked about human beings and their place in the world. Dave Robinson and Chris Garratt give a lucid account of Descartes' contributions to modern science, mathematics, and the philosophy of mind- and also reveal why he liked to do all of his serious thinking in bed.