One of the fundamental ways scientists measure the well-being of a nation is tracking the rate at which its citizens die and how long they can be expected to live. So the news out of the federal government Thursday is disturbing: The overall U.S. death rate has increased for the first time in a decade, according to an analysis of the latest data. And that led to a drop in overall life expectancy for the first time since 1993, particularly among people younger than 65.

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