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like what? are there more intelligent people? I've anecdotally heard this is a cause for crime reduction as people are less impulsive than they were, in conflict resolution? overall?

don't really know what takeaway I'm supposed to know about

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Are you really calling into question the well documented developmental effects of lead in human cognition and behavior

No, he’s asking for someone to expand on their five word sentence that is so generic it can be interpreted to support almost any thesis you want.

I don’t know anything about the effect of lead on human cognition and behavior, I’m asking you to tell me about it

If that’s even what their comment was about

How does that effect work?

your assumption wasn’t a “lead free” response, am I doing it right?

Lead exposure gives you brain damage: https://en.wikipedia.org/wiki/Lead_poisoning. If you damage your frontal lobes, you generally become more impulsive and less measured in your response to things. Ergo, chronic lead poisoning causes populations to become more aggressive and more likely to engage in crime.

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