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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.

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.

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.

Youngstown, Ohio, is considered a Democratic stronghold, but there is strong support for Donald Trump in the Mahoning Valley area this presidential year, which echoes memories of another outspoken, over-the-top political outsider — the late Congressman James Traficant.

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.

Mitt Romney and Paul Ryan compose the first presidential ticket in history not to feature a Protestant. And, of course, they're running against the first African-American president. All of these individuals point to an enormous shift in American demographics and political power.

"The top priority is diagnosis — the capability to be able to pick up this virus, should it emerge outside of China," says virologist John McCauley. Flu researchers are getting started on creating a vaccine, but there are still many unknowns.

Shortly after NPR's busy staff moved into the new building at 1111 North Capitol Street, another, equally busy team, got settled on the green roof: two hives of honey bees.

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.

Children's librarian Mara Alpert recommends 10 titles that will send youngsters off on brand-new adventures. In these books, kids will learn what baby animals do on their first day of life, what baseball games are like in Japan, and what happens when you read a poem from bottom to top.