Thursday

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In this photo from February 2010, an Iraqi man in Baghdad looks at a campaign poster for a woman candidate running in Iraq's March elections. By law, 25 percent of Iraq's parliament must be female — which means replacing men who would have won seats. Ali al-Saadi/AFP/Getty Images hide caption

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Wednesday

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A man picks up federal tax Form 1040 at a post office in Palo Alto, Calif., last April. Some of the wealthiest people in the U.S. want to pay higher taxes to help reduce the deficit. Paul Sakuma/AP hide caption

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The Boston Tea Party of 1773, as depicted in an old engraving. Bostonians dressed as Indians dumped 342 chests of tea overboard from three British ships in protest against "taxation without representation." The famous Tea Party took place at Griffin's Wharf, where the ships were tied up. The site remained a landmark even after the waterfront was filled in, leaving the spot several hundred yards inland. AP hide caption

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Monday

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Police officers walk past the Washington Convention Center in Washington, D.C., on Saturday, where security is tightening ahead of the Nuclear Security Summit. Jewel Samad/AFP/Getty Images hide caption

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Gas centrifuges used to produce enriched uranium sit in a plant in Piketon, Ohio, in 1984. The technology for laser-based enrichment is much smaller than technology using centrifuges, and would be easier to secretly develop for weapon production. Wikimedia Commons hide caption

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Friday

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At Oak Ridge National Laboratory, an employee works with a mechanical arm to manipulate items inside the radioactive hot cell. The hot cells are used to manufacture new reactor fuel made from spent nuclear waste. Courtesy of Oak Ridge National Laboratory hide caption

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