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Faulty forms of the brain protein tau trigger tangles inside and outside brain cells of Alzheimer's patients. Scientists say figuring out how to stop bad tau's spread from cell to cell might be key.

The long-delayed project is a jobs generator to some and an ecological disaster to others. Ahead of a key Senate vote, we revisit what the Keystone XL pipeline would do and why it's so contentious.

A South African teenager got tired of waiting in the clinic for his grandparents' HIV meds. So he came up with a solution. All it took was a bicycle.

Why is Sierra Leone reporting an uptick in Ebola cases while Liberia's outbreak is slowing? The chain of events in one village points up the obstacles that the country is facing.

Half of people of Asian descent have double eyelids — folds above the lash line — and the other don't. There's a controversial surgery some people get to give themselves that crease.

Test your ability to tweet a recipe in 140 characters or less. Amateur cook and writer Maureen Evans tells us how she manages to do that, and breaks down her code in her Twitter cookbook, Eat Tweet.

A modern artist installed a high-tech brick path that glows in the starry night, an homage to one of Van Gogh's most famous paintings.

A new analysis by the Sunlight Foundation examines corporations that expend the most money in Washington on campaign contributions and lobbying. Defense contractors and finance giants lead the pack.

The U.S. throws out 35 million tons of food each year. While many restaurants, supermarkets and food firms are taking responsibility, many consumers are not. A pilot EPA program aims to change that.

With his brown skin and long dreadlocks, Marc Quarles stands out in his predominantly white neighborhood. He's particularly aware of that, he says, when his biracial children aren't with him.

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