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Roller derby teams had distinct bacterial colonies on their arms before a bout, researchers found. After pushing and shoving on the track, those colonies were more similar. The research is part of the push to identify the microbes that live on (and in) us.

Americans expect a lot from the president — any president. Modern presidents are believed to control the economy, when the reality is that they have fewer tools even to control Congress or public opinion.

Eighteen states have legalized the medical use of marijuana. As state laws change, physicians face new decisions about whether or not to recommend pot. Doctors have varying views on its therapeutic effects, as well as the ethical and legal ramifications.

Facebook COO Sheryl Sandberg has drawn a lot of attention with her "sort of a feminist manifesto" Lean In. Critic Maureen Corrigan finds that much of the book is bland, but toward the end, Sandberg's intellectual charisma breaks through.

Years of war have overtaxed Gaza's hospitals, making it tough for kidney patients to get good treatment. Thanks to help from British doctors, Gaza surgeons are now being trained to perform kidney transplants. They hope to help ease the huge demand for dialysis, but transplants have their own cost.

One name has been "retired." Others have never been reused. John is the most popular. It's a tradition going back to the year 533 that a new pope chooses a name other than the one he was born with. He's likely sending a message about what type of leader he hopes to be.

President Bashar Assad's government has repeatedly blamed religious extremists for the uprising. Now, the most prominent Muslim cleric says it is the religious duty of Syrians to fight in support of the government.

Amancio Ortega has just bumped Warren Buffett off his No. 3 spot on Forbes' list of billionaires. The Spanish entrepreneur's clothing chain has become highly popular around the world, but do you know the man behind the label?

This week on Valley Edition we take a hike into the foothills of Fresno County. Valley Public Radio’s Ezra Romero takes the listener on a journey through…

The longtime activist hasn't quite overcome the reputation of his early career, but the Rev. Al Sharpton now commands a uniquely powerful platform.