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Can you provide sources for the first point? Who theorised it? I've never heard of the use of lead gasoline being linked to crime ... Interesting to learn more.

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You can check out some of the references on the wiki page https://en.m.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesi...

This article does a deep dive into some of the effects thought to be related to leaded gasoline: https://www.motherjones.com/environment/2016/02/lead-exposur...

A 2018 follow-up piece: https://www.motherjones.com/kevin-drum/2018/02/an-updated-le...

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