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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.

With the help of grow lights and air exchange fans, NASA is growing lettuce on the International Space Station. The scheme could help keep food costs down — and keep astronauts happy tending plants.

The Environmental Protection Agency has announced strict new carbon emissions regulations. Washington state has the largest reduction target — about 72 percent overall.

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

It will start drawing on Web browsing data to determine what ads users see, while allowing them to edit their own data profiles. Privacy advocates say the changes put too much burden on consumers.

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.

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.

Vladimir Putin's popularity soared after the Winter Olympics and the annexation of Crimea. But his year is ending on a bitter note, with Russia in a deep recession and isolated internationally.

While snowed-in Buffalo, N.Y. digs out, some Buffaloans are trying to figure out how to get home for Thanksgiving. That includes college students preparing for a difficult drive.

Many of the displaced ended up in camps in the city of Yola. Now they're racing further away as concerns grow that Yola also faces attack, and that the government isn't doing enough to stop it.