Anti-nuclear activists (from left) Gregory Boertje-Obed, Sister Megan Rice and Michael Walli, pictured Feb. 6 in Knoxville, Tenn., were sentenced to prison terms on Tuesday for the 2012 break-in at Y-12 National Security Complex in Oak Ridge. Linda Davidson/The Washington Post/Getty Images hide caption

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The National Ignition Facility's 192 laser beams focus onto a tiny target. LLNL hide caption

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Scientists Say Their Giant Laser Has Produced Nuclear Fusion

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Negotiators at their round table in Geneva, where talks are being held about Iran's nuclear ambitions. Denis Balibouse /Reuters/Landov hide caption

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On 'Morning Edition': NPR's Peter Kenyon reports from Geneva

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U.S. Secretary of Defense Leon Panetta is given a traditional Maori welcome onto the grounds of the Government House on Friday in Auckland, New Zealand. Phil Walter/Getty Images hide caption

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Tom Gjelten reporting

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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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