By Eric L. Zielinski(NaturalNews) According to the work produced by the Greater Boston Physicians for Social Responsibility in 2000, In Harm's Way: Toxic Threats To Child Development, millions of U.S. children exhibit learning disabilities, reduced IQ, and destructive, aggressive behavior due to toxic chemical exposure. Developmental neurotoxicants are defined as chemicals that are toxic to the developing brain. They include the following: the metals lead, mercury, cadmium, and manganese; nicotine, pesticides such as organophospates and others that are widely used in homes and schools, dioxin and PCBs that bioaccumulate in the food chain; and solvents, including ethanol and others used in pains, glues, and cleaning solutions. These chemicals may be directly toxic to cells or interfere with hormones (endocrine disruptors), neurotransmitters, or other growth factors. Some of these chemicals are used extensively in manufacturing and are emitted in the environment upwards to millions of pounds annually. They can be passed to the developing child through the placenta, breast milk, or in food where they end up in our bones, blood, fat, urine, ovaries, and sperm. Many are so widely dispersed globally that Inuits in the Arctic, far from sources of industrial pollution, carry a significant body burden of some of these chemicals. They contend that it is clear that we can no longer ignore the mounting evidence that chemical exposures contribute to the epidemic of developing disabilities.