Research: At a half of inhabitants of United States of America IQ because of influence leads] is lowere

In the 1920th years producers of cars started adding lead in gasoline to reduce wear of engines. Because of it dangerous metal started getting to air through exhaust gases and to poison people. Most strongly pollution struck on children as lead breaks development a brain. The American scientists conducted research to find out how strongly influence leads affected locals. The result was unfavourable — by their calculations, the problem mentioned nearly 170 million people living in United States of America in 2015. All of them in the childhood were affected leads, because of what...