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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.

“The norm-shattering masks a more fundamental misunderstanding of how administrative power can bring about lasting change,” writes Joshua Sharfstein.