"What do you believe is true even though you cannot prove it?" This book brings together the best answers from very eminent contributors. Here is Ian McEwan on the absence of an afterlife; Richard Dawkins on the relationship between design and evolution; and Jared Diamond on when humans first reached the Americas. Other contributions span the whole range of scientific endeavour and human experience, from the future of computing to the origins of intelligence; from insights into childhood behaviour to cutting-edge cosmology. Thought-provoking and compelling, this collection is both a fascinating insight into the instinctive beliefs of some of the most brilliant minds alive today - and an invitation to answer the question yourself...