Hajj disaster: Are large crowds inherently dangerous?
As Saudi authorities investigate yet another deadly stampede during the final rite of the hajj pilgrimage Thursday, experts in crowd dynamics say that the root of such tragedies is more...
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Sierra Nevada snowpack hit 500-year low in 2015
When California Gov. Jerry Brown stood in a snowless Sierra Nevada meadow on April 1 and ordered unprecedented water restrictions because of the drought, it was the first spring in...
FDA panel considers lifting ban on blood donations by gay men
A U.S. Food and Drug Administration panel has begun to consider whether to overturn a long-standing ban against accepting blood donations from gay men.On Thursday, the FDA's Advisory Committee on...
Ebola is ‘not a death sentence,’ U.S. cases prove
When Amber Vinson walked out of Emory University Hospital in Atlanta on Tuesday, she became the sixth person in the country to be successfully treated for a disease that kills...
CDC: Ebola cases could go as high as 1.4 million by late January
In a grim assessment of the Ebola epidemic, researchers say the deadly virus threatens to become endemic to West Africa instead of eventually disappearing from humans. "The current epidemiologic outlook...
WHO endorses blood transfusions to combat Ebola, despite skepticism
As medical researchers struggle to produce desperately needed drugs to fight the Ebola outbreak, the World Health Organization on Friday endorsed an old-school remedy that is already abundant in Africa...
Girl who was declared ‘functionally cured’ of HIV now has active virus
A girl who was seemingly cured of HIV following aggressive drug therapy just hours after her birth was recently discovered to be infected with the virus that causes AIDS after...
DNA from skull links Ice Age girl to Native Americans alive today
The divers called her Naia, for "water nymph," because they discovered her teenage remains in a dark, underwater cave in Mexico's Yucatan Peninsula. She had been hidden there for more...
Environment radicals claim attacks on L.A. dealerships
For an organization with a secret membership, the Earth Liberation Front's beliefs, terrorist methods and history of attacks are about as public as a group's can get. Its Web site...
10,000-mile solo sojourn becomes a mystery at sea
Frank Guernsey's wife asked him why he planned to sail a tiny sloop around Cape Horn, the turbulent passage between South America and Antarctica, and the veteran skipper likened the...