Reminds me of at least one study that concluded that the reason for the big uptick in violence in the 70’s and 80’s was all the lead in things like gas and paint in previous decades. Basically pregnant women huffed a lot of lead and their offspring became more violent as a result. Measures were taken to reduce exposure to lead and violence went down. Also interesting to note is that the Middle East was decades behind in reducing exposure to lead and here we are.
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