Vox's Sarah Kliff offered six reasons for the fall in teen pregnancy rates earlier this year, but new research by Jessica Wolpow Reyes from Amherst suggests a seventh: fewer children having their brains poisoned by exposure to lead. The suggestion that lead contamination is an important driver of crime rates has gained currency over the past several years (Kevin Drum is a particularly dogged and persuasive advocate of this view), and the point of Reyes' research is to look at a broader range of social problems among youth.
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