Ah yes, sorry about the confusion. I was indeed talking about lead (Pb), or rather tetramethyllead as it was added to gasoline as an anti-knocking agent last ce

Ah yes, sorry about the confusion. I was indeed talking about lead (Pb), or rather tetramethyllead as it was added to gasoline as an anti-knocking agent last century. It's something that was suspected to be bad early on, but the scale of it wasn't realized until much later. Of course, political nonsense and corruption came into play as well. Just like now.