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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?

Everything you need to know to talk like a mibster.

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

Tensions are still high in a Missouri town where a black teenager was fatally shot by a police officer on Saturday. Religious leaders and activists are calling for calm and peaceful demonstrations after three nights of protests that alternately involved looting and police in riot gear.

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.

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.