Flint, Mich., has so much toxic lead in children’s blood that a state of emergency is declared. This is an extreme case, but the problem of lead exposure among children is not a local Flint story. If you look at public health data, you begin to realize two things. The first is that it’s actually really hard to get good data on which kids do and don’t experience lead exposure, and which parents should worry about the issue. [VOX]

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