In the 1970s, the U.S.
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In the 1970s, the U.S. Environmental Protection Agency (EPA) cracked down on lead-based products including gasoline because of their toxic effects on human health. Now, scientists at the University of Utah have released the findings of a study looking at 100 years' worth of human hair samples, and found that the regulatory action worked. Here's more from @arstechnica.
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