You know all about the Greeks and Egyptians, and perhaps even the Hittites and Olmec. But a new exhibit featuring dazzling remains of a sophisticated yet largely unknown culture that predates them all has arrived on American soil. New York University's Institute for the Study of the Ancient World has opened "The Lost World of Old Europe: The Danube Valley, 5000-3500 B.C." The people showed remarkable advancement for their time.