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Afghan officials are looking to stop the wave of "green on blue" attacks against coalition troops.

The Democratic convention has put a spotlight on national politics. But for the nation's mayors, all politics is local. Host Michel Martin speaks with Philadelphia Mayor Michael Nutter, the president of the U.S. Conference of Mayors. He talks about the challenges facing American cities.

Forget the notion of great inventors toiling in isolation. There's plenty of proof that geography has a big influence on innovation, with some cities inspiring far more innovation than others.

In a piece for The New Yorker, Sarah Stillman tells the stories of several young offenders who were killed while or after working as confidential police informants. Stillman, officer Brian Sallee and trial lawyer Lance Block discuss how legislation could help this largely unregulated system.

Many people buy and eat organic food because they believe it's more nutritious. A new study suggests that may not be the case. But with a vast number of influences and variables, from the ripeness of produce to the length of the studies, researchers note that more research is needed.

Zadie Smith wrote her last novel On Beauty seven years ago — a long time in the anxious world of publishing. Her new novel NW was released in the U.S. on Monday. Critic Maureen Corrigan asks: Was it worth the wait?

Former President Bill Clinton is set to speak Wednesday night at the Democratic National Convention in Charlotte, N.C. Delegates and officials talk about what they hope to hear from Clinton and what his role is in the party.

Actress Eva Longoria has taken a large role in the Obama campaign and is scheduled speak at the Democratic National Convention on Wednesday night.

At the Paralympics, the South African double amputee faces his rivals in the 100-meter sprint.

Cage's most lasting influence may be in his ideas — about the boundaries between noise and music and the artistic freedom that comes from breaking the rules.