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Web extra: The lesson of nukes: Be really, really careful

Yukiya Amano, director general of the International Atomic Energy Agency, talks with Rachel Maddow about the lessons of Fukushima, plus the need to get loose nu

Yukiya Amano, director general of the International Atomic Energy Agency, talks with Rachel Maddow about the lessons of Fukushima, plus the need to get loose nuclear material safely under control.