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Health experts are "fairly certain" that nine people had enough direct contact with an Ebola patient that they could potentially have been infected. None of them have shown symptoms, the CDC says.

About one-third of black and Hispanic teens say they're online just about all the time, compared with about 1 in 5 whites, a new study says. Experts say smartphones are defining teens' social habits.

President Obama has launched a sustained, long-term military campaign against the Islamic State, also known as ISIS or ISIL. Four legal experts debate whether he had the constitutional power to do so.

Despite considerable effort to improve care for people who are dying, more people are reporting pain and depression, a study finds. Medical treatments that lengthen the process may be one reason.

Led by a celebrated Yazidi fighter, a small band of Kurdish peshmerga survived a months-long ISIS onslaught. Unlike others in Syria and Iraq, this sacred place still stands, nearly unscathed.

Mistakes are made. If the health insurance marketplaces screw up in calculating subsidies for consumers, it's the individual who is likely to be on the hook for repaying the excess.

Data indicate the U.S. economy grew at an impressive 5 percent rate in the third quarter. The stock market hit another record on Tuesday. David Greene talks David Wessel of the Brookings Institution.

President Recep Tayyip Erdogan says the massive presidential complex is a symbol of Turkey's growing importance. But as one opposition politician puts it: Only dictators want to live in palaces.

When science cannot explain patients' recoveries, even a doctor who studiously makes decisions based on the medical evidence is forced to rethink his ideas about hope and miracles.

Measles infected hundreds of children at a Philadelphia church whose members didn't believe in modern medicine. In a rare step, health officials moved to compel the families to vaccinate the kids.