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The WHO said an Ebola outbreak first seen in the Democratic Republic of the Congo was an international public health emergency, underscoring the world's concerns.

Bill Cassidy, leader of the Senate committee that oversees health policy, is fighting for his political life in Louisiana's Republican primary on Saturday.

“There's been interest in longevity, promoting it, for millennia. But this 25-year campaign really brought it to the forefront,” Eric Topol says of blue zones.