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07/31/2007: "Environment affects higher castes less than poor"

The heritability of IQ at the low end of the wealth spectrum was just 0.10 on a scale of zero to one, while it was 0.72 for families of high socioeconomic status. Conversely, the importance of environmental
influences on IQ was four times stronger in the poorest families than in the higher status families.

[ The poor are more effected by environmental/nurture components to upbringing than the rich, who appear to be mostly formed by genetic inclinations. A timely justification for a caste system like that used in ancient Europe and India. ]

http://www.washingtonpost.com/wp-dyn/articles/A12059-2003Sep1.html