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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.

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.

U.S.-China tensions are rising on almost every front, and there are plenty of parallels to the U.S.-Soviet rivalry. Analysts say competition is inevitable, but doesn't have to lead to confrontation.

Over his 12-day winning streak, James Holzhauer now holds the top five slots for single-day winning records on the show. "You need to pick your spots and bet big," he tells NPR.

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.

President Trump said that taming unexpected medical bills would be a top priority for his administration. The sentiment found support from many in Congress.

The president complained that his chiefs of the intelligence services were too "passive" and "naive" after a Senate hearing that underscored how often the White House rejects their assessments.

Each year Chinese youth teams send members to a Brazilian academy for 10 months of soccer coupled with regular school lessons, including classes in Portuguese.

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.

Algeria, Morocco, Tunisia and Mauritania have a turbulent history. But they've created a joint bid to secure world heritage status for a food with deep roots and cultural meaning across the region.