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After four years of ebbs and flows in Syria's civil war, rebel fighters are pushing back the president's forces. He's having trouble replacing soldiers. And his allies may be providing less support.

Messenger was launched from Earth in 2004. After 4,104 orbits of Mercury and billions of miles of space travel, the orbiter ended its mission with a quiet bang Thursday.

The Pap smear has dramatically decreased rates of cervical cancer, but testing too often has a downside, too. Many women say they aren't yet ready to follow new guidelines and skip the annual tests.

Chipotle says providing "food with integrity" means dropping genetically modified ingredients. But critics say the company's new policy is inconsistent and even dishonest.

One aim of Obamacare was to ease the financial strain on nonprofit hospitals that provide medical care to people who lack insurance and can't pay their bills. That plan is working, hospitals say.

Fresno native Mark Arax has written about the war over water in his state for decades. "It used to be the farmers against the delta smelt fish, and now it's the urbanite against the almond," he says.

Today, President Obama announced a massive effort with major publishers to make thousands of e-book titles free for low-income kids.

Words describing the same event can mean very different things. It's no surprise that people can't agree on a label for what's happening in Baltimore.

That, in case you're wondering, is another 3 million years. Astronomers made that calculation after producing the first 3-D view of the pillars made famous by the Hubble Space Telescope.

There are clues about your activity level and metabolism in urine. Researchers hope to one day predict obesity risk by tracking the different levels and ratios of certain molecules in pee.