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The death of Brazil's Socialist Party presidential candidate created an opportunity for his running mate, Marina Silva. Her entry into the race has upended the situation. Whereas the man she replaced was running a distant third in polls, support for Silva has surged.

As oil prices dip, controversial and relatively expensive production methods, like oil sands and fracking, have become less profitable. Some drillers are already cutting back on plans for more wells.

It's common for some clinics in rural America to consult medical specialists by video for difficult cases. Dartmouth is testing a robot that connects trainers to a neurologist who is miles away.

The same Atlanta hospital that treated the first U.S. Ebola patient in August discharged its fourth patient Tuesday. All survived. Patients in isolation need extra emotional support, the team says.

One of the most famous childhood stars of all times, Shirley Temple Black has died. Remembered for her curls and acting talent, she became the face of hope during the Great Depression.

The world is at greater risk than ever from pandemics and biological weapons, health officials said Thursday. In response, the U.S. government is spearheading a global effort to build an early warning system for infectious diseases, drug-resistant microbes and possible bioterror agents.

President Obama used to say that he wanted to rely more on career diplomats to serve as U.S. ambassadors. But he's been opting for political appointees who are big donors with limited international experience.

At the Vancouver games, Canada won the most gold medals. Now fans are cheering on their teams in Russia: A moving, yelling, living, breathing mass of Canadian pride.

The men's team is stacked, built — whatever you call it, their biceps are busting out of their shirt sleeves. And it's not just the Canadians; the world's elite curlers are extremely fit.

Talks in Vienna about Iran's nuclear program kick off what could be a year of negotiations. Negotiators are seeking a deal to follow the temporary agreement now limiting Iran's nuclear program.