ITHACA, N.Y. - Lenore Durkee, a retired biology professor, was volunteering as a docent at the Museum of the Earth here when she was confronted by a group of seven or eight people, creationists eager to challenge the museum exhibitions on evolution. They peppered Dr. Durkee with questions about everything from techniques for dating fossils to the second law of thermodynamics, their queries coming so thick and fast that she found it hard to reply. After about 45 minutes, "I told them I needed to take a break," she recalled. "My mouth was dry." That encounter and others like it...