Professional danger comes in many flavors, and while Richard Colling doesn't jump into forest fires or test experimental jets for a living, he does do the academic's equivalent: He teaches biology and evolution at a fundamentalist Christian college. At Olivet Nazarene University in Bourbonnais, Ill., he says, "as soon as you mention evolution in anything louder than a whisper, you have people who aren't very happy." And within the larger conservative-Christian community, he adds, "I've been called some interesting names." But those experiences haven't stopped Prof. Colling -- who received a Ph.D. in microbiology, chairs the biology department at Olivet...