Is the Biosphere in Jeopardy?
Jennifer Dungan, Research Scientist, NASA Ames Research Center
Terry Root, Professor of Biological Sciences, Stanford

Are We Alone in the Cosmos?
Chris Chyba, Carl Sagan Chair for the Study of Life in the Universe, SETI Institute
Dan Werthimer, Chief Scientist, SERENDIP and SETI@home, UC Berkeley

Will Nanotechnology Change the World?
Steven Block, Professor of Applied Physics and Biological Sciences, Stanford
Alex Zettl, Professor of Physics, UC Berkeley

Is There a Fountain of Youth for the Brain?
Dale Bredesen, President & CEO, Buck Institute
Meredith Halks-Miller, Head of Pharmacopathology, Berlex Biosciences

Have Humans Stopped Evolving?
Terrence Deacon, Professor of Anthropology, UC Berkeley
Eugenie Scott, President, National Center for Science Education

Do We Understand Time?
Raphael Bousso, Assistant Professor of Physics, UC Berkeley
Hubert Dreyfus, Professor of Philosophy, UC Berkeley