Fourteen scientists ponder everything from string theory to true love.
"What 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 ofEdge, 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 .