We’ve been studying the impact of toxins on children for the past 30 years and reached the inescapable conclusion: little things matter. We’ve discovered that extremely low levels of toxins can impact brain development. We have also discovered that subtle shifts in the intellectual abilities of individual children have a big impact on the number of children in a population that are challenged or gifted. Steps should be taken to reduce children's exposure to toxins or suspected toxins. You can read more about how toxins impact brain development and the supportive documentation for this video here: arjournals.annualreviews.org/eprint/FJr4TmUFKKCgt9Dj8KYX/full/10.1146/annurev-publhealth-031912-114413