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Democrats vying to be the presidential nominee see Elizabeth Warren as their biggest rival. Testimony continues in the House impeachment probe. And, a humanitarian crisis escalates in northeast Syria.

Companies are trying to figure out the risks to their profits from a warming planet. Some of them are turning to high-tech tools of climate science.

Alex Yiu was born a seemingly healthy baby. But by age 2, his muscle control and speech were deteriorating. His baffling condition took a decade to diagnose. The reanalysis of a DNA test was the key.

Elizabeth Warren faced new scrutiny, Pete Buttigieg controlled multiple exchanges, and the potential conflicts of interest of Joe Biden's son got relatively little focus.

All the candidates oppose President Trump's recent troop withdrawal. But the two military veterans on the stage revealed a lack of consensus over how the U.S. should move forward in the Middle East.

Parts of the island nation are still in ruins, thousands remain displaced and rebuilding efforts have only just begun. But locals and volunteers are making a difference.

Former White House aide Fiona Hill told impeachment investigators on Monday that she and former Trump adviser John Bolton were troubled by actions by the president's private lawyer.

There's not a ton of room to grow grapes in Bolivia; many of its vineyards are located in mile-high mountain valleys and foothills. The country's wine output may be small, but it's winning big awards.

The Trump administration blocked the nation's top consumer protection agency from digging into problems with a program designed to help police, firefighters and other public service workers.

The largest-ever federal action concerning the U.S. opioid crisis has only gotten more complicated amid a slew of recent settlements. So here's a brief(ish) explainer breaking it down.