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Men’s average testosterone levels have halved in last 50 years, say scientists
(www.theguardian.com)
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That's the thing. I know that it's usually said that women's education is the best predictor of declining birth rates, but I can imagine women's education rates being highly correlated with levels of endocrine disruptive chemical exposure. When countries adopt modern cultural norms, they also tend to start using a lot more plastic and other artificial materials.