Guests: Floyd Bloom Editor-in-Chief Science Chairman, Department of Neuropharmacology Scripps Research Institute La Jolla, California John Bahcall Editor, Unsolved Problems in Astrophysics (Princeton University Press) Richard Black Professor of Natural Sciences Institute for Advanced Study Princeton, New Jersey Stuart Samuel Editor, The Bible According to Einstein (Jupiter Scientific Publishing Company) Research Physicist Columbia University Professor, Physics City University of New York New York, New York Jane Maienschein Science Advisor to Congressman Matt Salmon (R-Arizona) Professor, Philosophy and Biology Arizona State University Tempe, Arizona Lists are in—the best movies, the best novels—but what about the biggest unanswered questions in science? Is the dark matter mystery number one? How about the fate of the universe? Or is the real question how our brains allow us to contemplate these issues in the first place? In this hour, we'll take a look at science's outstanding enigmas.