In "Electric Power Plant Emissions and Public Health" by Alane B. O'Connor and Callista Roy (February), a callout on page 65 incorrectly summarized the findings of a study by Trasande and colleagues (Environmental Health Perspectives 2005; 113[5]:590-6). The callout should have read, "One study found that between 7.8% and 15.7% of the annual birth cohort are exposed in utero to potentially harmful levels of methylmercury, which is associated with impaired neurologic development and a 'small but significant loss of IQ.'"