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The failure of an experimental drug that targets clumps of protein inside the brains of Alzheimer's patients called into question one of the leading theories about the cause of the dementia.

The ancient canals of Mexico City's Xochimilco borough are packed with colorful barges, centuries-old floating gardens, and boats selling an array of local street foods.

Computer detection of potentially false stories; labeling news that might be false; cutting ad revenue: Those are steps Facebook could use to combat fake news.

Searching for alien life is harder than you might think, because whatever is out there might be really odd. So leading astrobiologists are meeting to advise NASA on how to go about looking for it.

North Korea may face tougher sanctions in response to its most recent nuclear test, the most powerful blast yet. But Pyongyang keeps finding workarounds to the punitive measures.

Pho has a rich role in Vietnamese, Vietnamese-American, and now, American culture. That's why a video featuring a white chef explaining how to eat pho as the next trendy food angered so many.

Keo Motsepe reflects on what dancing has taught him — and what he's teaching folks about his homeland.

It took about 30 teams of scientists worldwide, using supercomputers to churn through mountains of data, to see patterns aligning of what will happen decades and centuries from now.

Loneliness takes a toll on many aspects of health, in part because it activates a fight-or-flight immune response. That may have helped ancestors survive lonely exile, but can slowly kill us today.

NPR's Scott Simon and ESPN.com's Howard Bryant talk retirement news for David Ortiz, Tony Romo's broken clavicle and Bryce Harper's new MVP status.