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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.

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.

The Soviet Union dominated women's gymnastics, but the Russian team has not fared nearly as well in recent years. The women and coaches of the current team hope to reclaim their former glory at the London Olympics this summer.

The Stanley Cup finals are set, the NBA playoffs feature a thrilling matchup between Texas and Oklahoma, and the French Open, uh, opens. Host Scott Simon catches up on the week in sports with NPR's Tom Goldman.

The Myanmar opposition leader is being criticized for cooperating with the former military rulers who kept her under house arrest for nearly two decades. But supporters say she is trying to show she has what it takes to lead the nation.

The Guardian newspaper says the insider who blew the whistle on the NSA's probing of major U.S. Internet and telecom companies is a 29-year-old analyst who's been working for the agency under a government contract. His name is Edward Snowden.

Robert Siegel speaks with Joel Kotkin, a Presidential Fellow in Urban Futures at Chapman University and an adjunct fellow with the Legatum Institute in London, about blue states in the U.S., economic self interest and a potential economic suicide pact.

There's plenty of action to be found on statewide ballots this election season. Colorado voters must decide whether to raise income taxes to provide more funding for public schools, and how much to tax marijuana sales. In Washington state, a fight over labeling genetically modified foods is drenched in cash.

Steinway & Sons has made its cast-iron plates at the O.S. Kelly Foundry in Springfield, Ohio since 1938. Just two men create and pour the molten mixture that cools into the cast-iron heart of a piano.

Surprising upsets at the U.S. Open on Saturday when both two top players were eliminated. NPR's Lynn Neary talks with Mike Pesca of Slate.com about that and the upcoming NFL season.