When we talk about the health of America, we often talk in broad strokes. We focus on big trends—say, in obesity or diabetes—not what's happening at a more local level.
That's unfortunate, for two reasons. One, we might miss some of the variety of health out there: for example, that one county in a state is appreciably less healthy than another. And, two, we might overlook local factors that affect our health as much as federal or state policy, or even our own pers...
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