hristina: editor and chief of "Scientific American" Douglas Envin; Douglas H. Erwin; Professor, Santa Fe Institute ,Senior Scientist and Curator of Paleobiology, Smithsonian National Museum of Natural History, Paleobiology Ira Flatow: the big bang theory Wendy Freedman; Astronomer steve Weinberg; American

Professor for the Understanding of Science, Oxford Un=versity Founder, Richard Dawkins Foundation for Reason and Science Douglas Erwin Curator of Paleobiology, Smithsonian Museum of Natural History Wendy Freedman Director, Carnegie Observatory David Gross Nobel Laureate Director, Kavli Institute for Th