Intended for both the layman and the scientist, this book presents an overview of some of today's great scientific questions, from the way in which we acquire language and the fundamental nature of our thinking processes, to the possible existence of life elsewhere in the universe. Each chapter is constructed in the form of a trial, with the conventional scientific wisdom presented by the "prosecution" and alternative views put forward by the "defence". The author, who aims to be both informative and entertaining, subsequently steps in to act as "juror", offering explanations of his verdicts.