This is the actual paper: https://www.pnas.org/doi/abs/10.1073/pnas.2118631119 https://www.pnas.org/doi/abs/10.1073/pnas.2118631119 and surprisingly the MSM art

This is the actual paper: https://www.pnas.org/doi/abs/10.1073/pnas.2118631119 https://www.pnas.org/doi/abs/10.1073/pnas.2118631119 and surprisingly the MSM article about it pretty much just repeats the abstract and uses the same headline. I think that the headline refers to the fact that 1/2 the current US population were children before leaded gasoline was phased out.