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To subscribe, E-mail the words . . Three out of every five black and hispanic Americans live in communities that have uncontrolled hazardous waste sites. Even exposure to amounts of lead considered safe for children caused lower scores on tests of problem-solving, perception, memory, learning and coordination. The Boston researchers studied 249 infants over a two-year period, dividing them into three groups according to their exposure to the metallic poison, lead. Lead exposure was judged from blood samples taken from umbilical cords at birth.