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Documents have been released in the investigation of George Zimmerman's shooting of Trayvon Martin. Zimmerman, a neighborhood watch captain, shot Martin, an unarmed teen. He's claiming self-defense. Robert Siegel talks to Greg Allen.

President Obama recently made a surprise visit to Afghanistan where he gave a speech to wind down the war in the country. Tom Hayden of The Nation breaks down Obama's speech to discuss what the president's words really mean.

Keeping tabs on the arm of government that constantly invokes national security to justify its opaqueness can be a frustrating experience for members of Congress.

The "NSA leaker" and representatives of human rights organizations met with the media at Moscow's Sheremetyevo Airport, where he's been since June 23.

NPR's Ari Shapiro joins host Scott Simon to talk about the Obama administration's week. The president was buffeted by revelations that the IRS had targeted Tea Party groups seeking tax-exempt status and that the Justice Department had subpoenaed reporter phone records. On top of that, Republicans continue to allege that the White House engaged in a cover-up of talking points about the attack in Benghazi, Libya.

Architects have come up with spectacular concepts for vertical farms that would grow crops in city skyscrapers. But many horticulturists think the future of vertical farming isn't in skyscrapers, but rather in large, indoor warehouses lit up magenta by superefficient LEDs.

A declassified CIA report about the U-2 spy plane program lifts some of the veil of secrecy about a part of Nevada that fascinates sci-fi fans. For instance, the men who wanted to turn it into a top-secret site almost died the first time they went there. That's among five things interesting details.

The Muslim Brotherhood and its supporters are back in the streets. The government has said it will use live ammunition to protect public buildings and security forces. After Wednesday's crackdown left more than 600 people dead and nearly 4,000 wounded, the country is is shedding more blood.

Yahoo has redesign some of its major sites — the latest step in CEO Marissa Mayer's dramatic turnaround of the Internet company. Before Mayer interviewed for the job at Yahoo, her career at Google appeared to have stalled. Renee Montagne discusses this with Nicholas Carlson, who wrote a profile of Mayer for the news website Business Insider.

"Anyone who approaches this logically" would conclude that President Bashar Assad's forces used chemical weapons "on a massive scale" last week, White House spokesman Jay Carney said Tuesday. President Obama is weighing "the appropriate response," Carney added.