Ronald Reagan said it best: "The most terrifying words in the English language are: 'I'm from the government and I'm here to help you.'" Residents in many rural areas are relearning Reagan's lesson. It's one of the unintended consequences of the "No Child Left Behind" law. You see, the federal government now insists that every teacher must have a degree in every subject he teaches, or must pass an exam to prove he's "highly qualified" in that subject. That may make sense in Chicago or Los Angeles, where a teacher is likely to handle only one subject. For example, he'll...