It is lead...lead.   I wish there was a study of the impact of lead on humans...doesn't matter what race/color/creed...etc.  It is lead and other heavy metals.   We need a non-political study on heavy metals.,(reply>), @Peter Lund Disagree wholeheartedly.  Just an easy search will pull up research from the late 1900 and early 2000's.  Here's one: Lead effects on children.  There are pages and pages of studies for you to review.  The only folks that might disagree are the misinformation mongers...usually from foreign countries that are adversarial to democratic countries.,(reply>), It is not lead. It is known not to be lead. It has been known for a really long time.