By Alex Lang New York (Knewz) — Americans have lost a collective 800 million IQ points due to exposure to lead, a researcher found. Those IQ points come from more than 170 million Americans, which is about half of the country’s population. A researcher at Duke University said Americans born before 1996 might be at greater risk for lead-related health problems. That includes faster aging of the brain. In 1996, leaded gas for cars was banned and anyone born before then, including those in peak use of the 1960s and 70s, had high-led exposure, researchers said. Lead can erode brain cells after it …