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Today and tomorrow, heads of state from 47 nations will gather in Washington for the Nuclear Security Summit, the largest gathering of world leaders since 1945. Over the weekend, the National Guard worked to effectively clear out downtown. And last week, Obama released his Nuclear Posture Review.

(Flickr/Jim Greenhill)

Alexandra Gutierrez is a reporter based in the Aleutian Islands. She is also former associate web editor of The American Prospect.