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A neighborhood watch volunteer's fatal shooting of a Florida teenager raises questions about the risks involved when a community takes greater control over its own safety.

Wal-Mart has become the latest food retailer to announce that it's making changes after listening to customer concerns about lean finely textured beef, known by detractors as "pink slime."

Muamba, who plays for Bolton in the English Premier League, was "in effect, dead" for 78 minutes after suffering a heart attack, his doctor says. But doctors kept working. Multiple defibrillator shocks got his heart beating on its own again.

For more than a year, NPR's Michele Norris has run the Race Card Project, in which she asks people to express their thoughts on race in six words or fewer. Many have written to her with thoughts on the death of 17-year-old Trayvon Martin, which prompted a nationwide movement calling for justice.

When Colorado Rockies catcher Ben Petrick was 22, his doctors told him he had early-onset Parkinson's. He struggled to hide the symptoms, but, frustrated by his shaking and growing lack of mobility, he retired in 2004. Petrick has since focused on coaching, parenting and giving motivational speeches.

Like many grade schools, a growing number of universities are turning to standardized tests to measure students' educations. Advocates say they are an important tool to help gauge what students learn. Critics insist no single exam can ever accurately measure the value of four years of college.

New York Mayor, media magnate and public health zealot Michael Bloomberg said he will give $220 million to fight smoking in the developing world. Microsoft co-founder Paul Allen is giving $300 million for brain research.

Greyston Garcia followed a suspected burglar for about a block, then stabbed him to death. Based on Florida's "stand your ground law" a judge said he was acting in self defense.

Most gynecologists don't ask patients about their sexual orientation or if they're having sexual problems, a new study finds. That makes it hard for women to get appropriate medical care, the researchers say.

Hear Erika Wennerstrom's powerful, emotive rock band perform songs from its latest album, Arrow.