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For U.S. leaders, the Russian airstrikes have stoked concerns that they would be used against not only ISIS, but also against moderate rebel groups.

Nearly 11,000 more were injured. The toll includes four Americans who died at a Mount Everest base camp. In addition to food, the U.N. says medical supplies are desperately needed.

Earthquakes seem to be at their cruelest when striking developing nations like Nepal. A research center has tried to calculate how vulnerable nations are based on their resources and coping skills.

While still experimental, deep brain stimulation with implanted electrodes is being tested as a way to ease dementia in patients with Alzheimer's and other neurological conditions. Could it work?

Legend has it the moon gifted this drink to the Guaraní people of South America. It was banned by the colonial government. The Jesuits made it their most profitable crop. Oh, and the pope drinks it.

Who knows how much it takes to educate a child, and how do you find out? The state of Michigan is trying to answer those questions right now.

The Newport Folk Festival puts a high value on artists who speak truth to power. The best of this year's lineup features musicians with messages, who challenge popular perceptions of folk music.

The secretary of state seems unlikely to convince his Chinese counterpart that a diplomatic solution to the regional tug-of-war must be found.

America's culture war is being fought inside evangelical Christian circles. Some are resisting secular society's trends that conflict with biblical teaching. Others have found a way to live with them.

Our immune systems constantly fight off disease — protecting us from colds, flu and infection. An experimental treatment called immunotherapy is helping patients' immune systems fight off cancer.