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A monkey stumbled into the largest hydropower station in East Africa and managed to set off a chain reaction that caused a countrywide blackout lasting more than three hours.

Harvard researcher Kit Parker built his academic career studying the heart. But Parker, also an officer in the U.S. Army Reserve, switched his focus to figuring out how IED blasts damage the brain.

For authoritarian regimes, crushing all opposition can be bad for your reputation. Ethiopia's leaders have proven skilled at maintaining firm control while staging the ceremonies of democracy.

California voters will face an historic choice between two female, minority Democrats for senator in November. Our reporter Amy Westervelt has this…

In Alaska this time of year, it stays light almost through the night. The first pitch was at 10:30 p.m. The game was called in the 7th inning because of storm clouds and a briefly setting sun.

It's easy to see the Brexit debate as a British issue, but the vote could influence Americans in a variety of ways.

Sanders said Friday morning he will vote for Hillary Clinton in November because beating Donald Trump is most important. But he said he's focused on the Democratic Party platform.

In Scotland, which voted against leaving the European Union, Donald Trump praised the vote to leave. He predicted it's a sign of a populist revolution to come across Europe — and the United States.

A federal task force expanded the list of recommended colorectal cancer screening tests. Here's the lowdown on the tests and how they might be covered now and in the future by health insurance.

On paper, there's a tangled legal process, but it has never been tested and leaves some issues unaddressed.