Hair samples preserved in family scrapbooks across the past century have revealed the success of the US Environmental Protection Agency's (EPA) efforts to crack down on lead pollution since the 1970s.
Hair samples preserved in family scrapbooks across the past century have revealed the success of the US Environmental Protection Agency's (EPA) efforts to crack down on lead pollution since the 1970s.
Policies to phase out lead from products such as ... [2844 chars]