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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.

The U.S. has begun sending humanitarian aid and conducting limited airstrikes in the attempt to protect Iraq's refugee populations. Going forward, the U.S. is facing several possible approaches there.

A Spanish priest who was infected with the Ebola virus in Liberia has died at a hospital in Madrid. The Liberian hospital that Father Miguel Pajares had been working at in Monrovia is now shut down, because so many staff members have been infected with Ebola.

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.

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.

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.

A British cheesemonger wants to translate a French guide to raw milk microbiology into English. She says it has the potential to revolutionize our approach to cheese flavor and safety.

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.