Join Dr. Donald Yeomans of the NASA Jet Propulsion Laboratory at the California Academy of Sciences to learn why only an Earth impact by a large comet or asteroid has the potential to end civilization in a single blow. Yet these near-Earth objects also offer tantalizing clues to our solar system's origins, and someday could even serve as stepping-stones for space exploration. Yeomans introduces the public to the science of near-Earth objects -- its history, applications, and ongoing quest to find near-Earth objects before they find us. Reservations: Adults $12, seniors $10, and academy members $6.