05/24/2012 11:40 am ET

11 Worst Nuclear Accidents

Since the Manhattan Project began in the late 1930s, nations have experimented with nuclear power and fuel refinement. Unfortunately, there have been quite a few mishaps, accidents and tragedies. The International Atomic Energy Agency (IAEA) classifies these disasters on the International Nuclear and Radiological Event Scale, a seven-point scale ranging from one (an

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