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Four years of too little water is killing millions of trees in the Sierra, yet some giant sequoias still thrive. Tree-climbing scientists are exploring sequoias branch by branch to find their secret.

In 2011, just 41 health care providers prescribed more than $5 million each in medicines under Medicare Part D. In 2015, that number was 514. The rise of expensive hepatitis C drugs is a factor.

Just a few days before the first round in France's presidential election, a gunman in Paris killed a police officer. Candidates are now talking about security issues.

American women are poised to win far more medals than any other women's squad in Rio. As part of their relentless rise, they're also expected to outpace the U.S. men.

The Justice Department has been trying to take down the Aryan Brotherhood of Texas, a violent prison gang. In 2014, 73 members were convicted. But a top ABT member says the group is bowed, not broken.

It's still summer, which means it's hot dog season. But for all the democratic appeal they can rightly claim, hot dogs — also known as weiners — don't get…

In the face of abuse concerns, Medicare covered more prescriptions for potent controlled substances in 2012 than in 2011. Top prescribers often have faced disciplinary action or criminal charges.

Attorney General Eric Holder is in the homestretch of his first, and probably last, full term as the nation's top law enforcement officer. He talks to NPR about the country's ongoing struggle over civil rights, and what he wants to accomplish in his last months of government service.

Soccer, Spain's national pastime, has been tainted by racism. After two recent ugly incidents, debate is raging over how to punish racist fans, and if the teams they love should be held responsible.

This year's 11 top-grossing films starring black actors and by black directors almost doubles the number of last year's slate of comparable films. Industry watchers say Hollywood needs a stronger infrastructure of support for black filmmakers to sustain this level of racial diversity on and off the screen.