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An An; smarter kids do better in life. heritability of intelligence even by age 8 is accounting for more than environmental factors. The genes responsible for intelligence continue to increase toward their phenotypic limit well into adulthood. bottom line...."class rank" is a RESULT of intelligence not a CAUSE of differentiated success in life.....therefore "on average" a child of 8 in the top 25% of his class ....will stay in the top 25% of that same class as a senior (becasue they will all grow into their own personal and different intelligence phenotypic maximums as they age. But change schools or neighborhoods and all bets off (new population ...new class rank)

for additional research read "The Wilson Effect: The Increase in Heritability of IQ With Age"

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