How a modern-day mine disaster has turned a Pennsylvania community into a ghost town * For much of its history, Centralia, Pennsylvania, had a population of around 2,000. By 1981, this had dwindled to just over 1,000-not unusual for a onetime mining town. But as of 2007, Centralia had the unwelcome distinction of being the state's tiniest municipality, with a population of nine. The reason: an underground fire that began in 1962...