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Q&A with nuclear physicist Frank von Hippel

Nuclear physicist Frank von Hippel answers questions about Japan's deepening nuclear disaster.

Frank von Hippel, a former Clinton administration official and the current co-director of Princeton University's Program on Science and Global Security discusses Japan's worsening nuclear disaster that continues to deepen just days after the devastating earthquake and a tsunami hit Japan’s northeast coast.

Von Hippel discussed the crisis in greater depth with Brian Williams Tuesday on NBC Nightly News --you can watch it below. Click here for more reporting on this issue, and click here for answers to frequently asked questions about the crisis.