Mechanics of a Nuclear Meltdown Explained

After a powerful explosion on Tuesday, Japanese workers are still struggling to regain control of an earthquake and tsunami-damaged nuclear power plant amid worsening fears of a full meltdown. Which raises the questions: What exactly is a nuclear meltdown? And what is a partial meltdown? "This term 'meltdown' is being bandied about, and I think people think that you get the fuel hot and things start melting and become liquid," said Charles Ferguson, physicist and

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