[Advertisement] Jim Lounsbury: A simple mechanical accident at 4:00 in the morning last March at Three Mile Island touched off the worst accident in the history of American nuclear power.

Three Mile Island’s Unit 2 reactor had partially melted down that morning, releasing dangerous radioactive gases into the atmosphere and triggering a panic that would grip the nation for days ...

The lights are turning back on at Three Mile Island, the site of America's worst nuclear meltdown, after it has lain dormant for five years. WSJ goes inside to learn more about the delicate process of ...