Much To Smile About? Iranian President Hasan Rouhani prepares to address the 68th session of the U.N. General Assembly on Tuesday. Frank Franklin II/AP hide caption

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North Korean leader Kim Jong Un (right) claps during a ceremony unveiling statues honoring his grandfather and father, Kim Il Sung and Kim Jong Il, respectively, in Pyongyang last April. Ed Jones/AFP/Getty Images hide caption

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Iranian Foreign Minister Ali Akbar Salehi speaks to reporters on the third day of the 49th Munich Security Conference on Sunday. Tobias Hase/AP hide caption

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The Fukushima Power Plant in Japan had three safety measures in place to make sure the fuel rods inside the nuclear reactor do not overheat. For various reasons attributed to the earthquake that triggered a tsunami, the measures failed. bagalute/flickr hide caption

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