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President Obama meets New Zealand's Prime Minister John Key at the Nuclear Security Summit.

The threat is the stuff of Hollywood thrillers, but the work of keeping nukes out of the hands of terrorists is not so exciting. President Barack Obama hoped to rectify the imbalance by hosting a historic summit of foreign leaders. Can 47 world leaders keep nuclear material out of the hands of terrorists? Read more»

The Titan II missile museum is located just south of Tucson.

A treaty signed by President Obama and Russian President Dmitri Medvedev in Prague on Thursday would trim the two power’s strategic nuclear arsenals to their lowest levels in half a century. Read more»