so then the argument was, well, the relationship between high lead and low iq is because there s a social class difference. but i mean, that s where the animal studies were very important, and because it demonstrated that that didn t explain it. these are the animals we ve been using to study the effects of chronic lead treatment on behaviour in brain chemistry. there s a great deal of fighting among these animals, and they re very hard for experimenters to catch, which is another indication of reactivity and aggressiveness in them. a letter written by sir henry yellowlees, the government s chief medical advisor, has been leaked
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