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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.

"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.

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.

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.

Intra-party turmoil could spill over into the next election, with labor groups threatening primaries against members — even those who sit in swing districts — who sided with the president.

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.

President Obama and GOP nominee Mitt Romney disagree on a number of issues. But there are some aspects of education policy on which the two candidates are hand-in-hand. Host Michel Martin speaks with Education Week reporter Alyson Klein, who has compared each campaign's message on education.

Annah Backstrom of the Des Moines Register and Daniel Barrick of New Hampshire Public Radio talk to Robert Siegel about the latest developments in the presidential race.