What We Believe But Cannot Prove: Today's Leading Thinkers on Science in the Age of Certainty is a non-fiction book edited by literary agent John Brockman with an introduction by novelist Ian McEwan and published by Harper Perennial. The book consists of various responses to a question posed by the Edge Foundation, with answers as short as one sentence or as long as a few pages. Among the 107 published contributors are such notable scientists and philosophers as Richard Dawkins, Daniel C. Dennett, Jared Diamond, Rebecca Goldstein, Steven Pinker, Sir Martin Rees and Craig Venter. Some contributions weren't published, including those by Benoit Mandelbrot and computer scientist John McCarthy. However theirs are among 120 responses available online.