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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Marking the 10 year anniversary of a violent crackdown against student demonstrators, Iranians returned to the streets of Tehran Thursday to protest a disputed presidential vote. Kwame Holman reports.

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In other news, Alaska Gov. Sarah Palin announced her resignation effective later this month, and officials in Pakistan reported that 17 people were killed in a U.S. drone aircraft attack targeting members of the Taliban.

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