January 4, 2005 God (or Not), Physics and, of Course, Love: Scientists Take a Leap hat do you believe is true even though you cannot prove it?" This was the question posed to scientists, futurists and other creative thinkers by John Brockman, a literary agent and publisher of Edge, a Web site devoted to science. The site asks a new question at the end of each year. Here are excerpts from the responses, to be posted Tuesday at www.edge.org. Roger SchankPsychologist and computer scientist; author, "Designing World-Class E-Learning"Irrational choices.I do not believe that people are capable of rational thought...