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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.

Rick Scott, Florida's GOP governor, has come under criticism for his record on the environment. Now, he's rolling out his own proposals for safeguarding the state's water and wildlife preserves.

Many Star Trek gadgets have made the journey from science fiction to real life. Arun Rath talks to Grant Campany about the X Prize Foundation's competition to bring the medical tricorder to life.

Summer is high season for "frogging." The North American Amphibian Monitoring Project has hundreds of volunteers crisscrossing the country to get a better handle on the fate of the nation's frogs.

Who doesn't like a contest, especially if it lets you prove that you're smarter than your peers? When doctors played a game that tests their knowledge, patients' blood pressure control improved.

The St. Petersburg International Economic Forum is seen as Russia's answer to the economic gathering in Davos, Switzerland. The Obama administration has been pressing U.S. corporations not to attend.

King Juan Carlos announced he would abdicate in favor of his son, sparking a fierce debate over whether he should be allowed to pass on the crown — or if the monarchy should be abolished altogether.

Seattle minimum wage workers will see a gradual raise to $15 an hour — the highest in the nation. That won't end the argument about whether increases help or hurt employment.

The controversy over the exchange of a U.S. soldier for five senior Taliban fighters at Guantanamo Bay could rival or even surpass Benghazi.

President Obama is delivering the keynote address of his current trip to Europe in Poland. Earlier in the day, Obama is meeting with the president-elect of Ukraine, Petro Poroshenko.