Inside a nondescript building at Los Alamos National Laboratory known as TA-66, nuclear weapons inspectors are carefully trained in the detection of plutonium. Courtesy of Los Alamos National Laboratory hide caption

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How Do You Find Plutonium? Go To Nuclear Inspector School

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International Atomic Energy Agency Director-General Yukiya Amano earlier today in Vienna, after his return from talks in Tehran. Dieter Nagl /AFP/Getty Images hide caption

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Word Of Deal To Inspect Iran's Nuclear Program Raises Hopes For Broader Talks

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April 2010: Iranian President Mahmoud Ahmadinejad unveils a sample of the third generation centrifuge for uranium enrichment during a ceremony in Tehran on April 9, 2010. Iran says its nuclear ambitions are peaceful. Behrouz Mehri/AFP/Getty Images hide caption

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April 2010: Iranian President Mahmoud Ahmadinejad unveils a sample of the third generation centrifuge for uranium enrichment during a ceremony in Tehran on April 9, 2010. Iran says its nuclear ambitions are peaceful. Behrouz Mehri/AFP/Getty Images hide caption

toggle caption Behrouz Mehri/AFP/Getty Images