Academic motivation is due largely to genes (A/D) and nonshared environment (E) https://www.researchgate.net/publication/273126971_Why_children_differ_in_motivation_to_learn_Insights_from_over_13000_twins_from_6_countries …pic.twitter.com/7WZ1KIKmGT
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There's also good evidence that teachers don't matter, even for motivation. Large twin samples agree. http://www.sciencedirect.com/science/article/pii/S0191886915000987 …
We have no positive evidence of what E is, but we know a lot of that it isn't, which happens to be just about everything people claim it is.
