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We looked up U.S. hos­pi­tal­iza­tions in 2017 for each haz­ard in this is­sue. The size of each block above rep­re­sents its dan­ger: the big­ger the block, the more com­mon the peril. Some ex­is­ten­tial or in­ter­na­tional threats didn’t land any­one in Amer­i­can ERs (at least, not last year); those are marked to the right.

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