The literary agent John Brockman gathered in his Internet Salon "Edge" the intellectual elite, the elite, the smartest minds in the world, dealing with the latest developments in the natural and social sciences. They come from genetic engineering, psychology, philosophy, cosmology, and neurology. But the economist and Nobel Laureate Daniel Kahneman, the Apple co-founder Steve Wozniak and the best-selling author Ian McEwan have already expressed in "Edge". Each year Brockman his community a question. A question that many of the intellectuals have also already asked myself once. In 2005 it was: "What are you believe that you can not prove?" (What do you believe is true even though you can not prove it?).