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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.

He was persecuted because some of his own countrymen didn't like the tribe he belongs to. Now the quiet 27-year-old is an anti-tribalism activist.

Faced with an Ebola outbreak that keeps spreading, WHO has endorsed the idea of using unproven vaccines or treatments.

Julie Schumacher's anti-hero pens recommendations for junior colleagues, lackluster students and former lovers. The novel deftly mixes comedy with social criticism and righteous outrage.

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.

The urine test employers typically use to detect marijuana picks up cannabis smoked or swallowed days or weeks earlier. Should firms be allowed to fire workers who legally use marijuana at home?

More than 40 mosques in the Gaza Strip were destroyed or damaged in the recent fighting.

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 World Health Organization approved the use of an experimental Ebola drug. Now come the hard questions: Who gets a drug that is in scarce supply and how is its effectiveness determined?