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Re:The heritability of self-control: A meta-analysis by BurningFrog on Tuesday November 26, 2019 @03:37PM (#21642430)
In your own words:

> We have 3 sources of difference, genetic heritability, home environment and "others"

Clearly, school is not home environment.

Re:The heritability of self-control: A meta-analysis by username90 on Tuesday November 26, 2019 @03:45PM (#21642485)
School is determines by your home environment, hence it is a part of the home environment bucket. "other" is not: "everything except home environment and genes", it is: "everything not determined by the home environment or genes".