The U.S. military could accelerate its withdrawal from the Iraq war thanks to a sustained drop in violence, Defense Secretary Robert Gates said Wednesday after talks with his top commanders.

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The United States and China ended two days of high-level talks Tuesday, pledging to improve cooperation on economic and security issues, including on policies aimed at economic recovery and international non-proliferation agreements.

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In other news, new home sales leapt 11 percent in June, the largest monthly gain in nearly nine years, and the U.S. warned Iran it could face tough sanctions if it rejects talks on its nuclear program.

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The United States does "not intend to reward North Korea" simply for returning to negotiations over its nuclear ambitions, Secretary of State Hillary Clinton warned Wednesday on a trip to Asia. Regional experts analyze her visit with Margaret Warner.

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In three short years, Twitter has become one of the Web's most heavily trafficked sites. But is the micro-blog simply a fad, or a technological game-changer? Jeffrey Brown explores.

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Major new protests erupted in Iran Friday in the wake of last month's disputed presidential election. Experts join Judy Woodruff to assess the ongoing tensions in Tehran.

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More than month after its election, anti-government protestors continue to show their defiance for the sitting government. Lindsey Hilsum of Independent Television News reports.

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In other news, large gains in the banking and tech sectors led markets higher, and a passenger plane crashed in Iran, killing all 168 people on board.

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Margaret Warner, who has been reporting on the scene of the G-8 summit, discusses the meeting's conclusion and President Obama's next stop in Ghana.

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Iranians returned to the streets of Tehran Thursday to protest a disputed presidential vote. Analysts assess the latest developments.

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