A century of hair shows how lead exposure collapsed

For decades, Americans were surrounded by lead from car exhaust, factories, paint, and even drinking water, often without realizing the damage it caused. By analyzing hair samples preserved across generations, scientists uncovered a striking record of how exposure soared before environmental rules and then collapsed after leaded gasoline and other sources were phased out.

from Top Society News -- ScienceDaily https://ift.tt/iKDl3gc