of lead and poor nutrition and poverty - and schools and students and teachers
Advances in cognitive science have made it possible to pinpoint how these disadvantages hinder children academically. One-fifth of the middle schoolers in Providence, Rhode Island, for example, entered kindergarten in 2003 suffering from some level of lead poisoning, which disproportionately affects the poor and is associated with intellectual delays and behavioral problems such as ADHD. “It is now understood that there is no safe level of lead in the human body,” writes education researcher David Berliner, “and that lead at any level has an impact on IQ.”Food insecurity is similarly correlated with cognitive delays, and rising in incidence across the
