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A panel convened by the World Health Organization has approved the use of experimental drugs and vaccines to combat the Ebola outbreak, so long as certain conditions are met.

Iraqi military helicopters have been bringing food and water to Yazidi refugees trapped in the mountains near the Iraqi city of Sinjar, also at times even evacuating people off the mountain.

Studies warn that climate change will threaten corn production in coming decades. Meanwhile, farmers are experimenting with new planting methods in hopes of slowing soil erosion from torrential rains.

Linguist Mark Liberman, who works at the University of Pennsylvania, says the use of "um" or "uh" can provide signs about the speaker's gender, language skills and life experience.

Robin Williams reportedly suffered from severe depression before his death. Former TV talk show host Dick Cavett recalls his interview with Williams and his own struggles with depression.

The companies, which help customers request car rides on demand, both say their competitor has intentionally requested and then canceled rides on drivers.

In just a few years, the issue has gone from mostly whispers to receiving the attention of the White House. Now, colleges throughout the country are trying to increase awareness about the issue.

As the entertainment world mourns the loss of comedian and actor Robin Williams, NPR film critic Bob Mondello offers an appreciation.

She was loved for her smokey voice and alluring gaze. NPR's Robert Siegel talks about the Hollywood star and her career with correspondent Neda Ulaby.

The debate about whether it's OK to engineer and study microbes that could prompt a human pandemic has reignited. Each side now has a website and its own list of Nobelists and superstar supporters.