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In November 2000 , the Ha Noi-based Research Center for Gender , Family , and Environment in Development concluded that children in families affected by Agent Orange can suffer " skin rashes , severe personality disorders , memory loss , enlarged head , organ and metabolic dysfunction , missing or abnormal reproductive organs , miscarriages , cancers , numbness , hearing loss , child deaths , birth defects . In a subsequent report , based on a sample of about five hundred schoolchildren who were given IQ tests and classified by their teachers into five social-class groups , Terman concluded that children of higher social classes make a better showing on the test primarily because of their superiority in original endowment . Adler concludes that children in the family should be treated equally , but each child in a particular way . By Jennifer GarvinTwo studies in the April 19 issue of the Journal of the American Medical Association conclude that children with dental amalgam fillings do not experience adverse effects related to neurobehavioral , neuropsychological ( IQ ) and kidney function , reinforcing the ADA 's longstanding position on the safety of dental amalgam . Marcon concluded that children 's later school success appears to have been enhanced by more active , child-initiated early learning experiences , and their progress may have been slowed by overly academic preschool experiences that introduced formalized learning experiences too early for most children .