put more emphasis on better upbringing
What do you mean specifically with that sentence?
Nutrition, intellectually stimulating environments, presence of both parents, and existence of other children to play with have all been shown to be positively correlated with doing better at school, for one. I'm sure there are many other factors.
Another point, not directly related to your question, but related to OP's question, is that an IQ of, say, 130 may not be that high (and definitely not that high compared to the LW average) but it is 2 standard deviations above the mean... if everyone reached that average level of intelligence it would be a vast improvement in average intelligence over what it is now.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
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