Just what I and my friend Karl knew all along. Long Live the Revolution!

The heritability of g was estimated to be 0.77 (95% CI: 0.66-0.84). Estimated heritabilities for lower-order factors were also substantial.

i assume this is still broad sense?

There is a beautiful little adopted Asian girl in my daughter's class. She is like a little "china doll," really.

She has been adopted by a lower middle class working family where I am located. The mother works in a hotel and she could even be a maid there. (In this country the native "white" people still do these jobs.)

The little girl is friends with my daughter but she is very shy. To invite my daughter over for a play date, she wrote a full page, single-spaced, letter to my daughter in perfect penmanship.

The girls are still learning how to read and I admit my daughter could probably not have written such a letter, but my daughter is a very "social" animal, so to speak - that is, she is popular.

Anyway, there was no doubt in my mind when I saw this letter that the cognitive ability in this girl was innate, and that the environment she is growing up in will have little negative effect on her so long as it is loving and supportive, which it is.

Her adoptive parents absolutely adore her and treat her like a treasure.

i assume this is still broad sense?

Rather complicated. It was assumed that all genetic effects were additive. The presence of dominance deflates the DZ correlation relative to the MZ, while assortative mating (which appears to be substantial in this sample) inflates the correlation. To some extent these factors cancel each other, which allows for good fit to complete additivity tenable in the twin design.

The twin method is not that great at distinguishing between heritabilities in the narrow and broad senses. To get at the former, we need parents and offspring. The Texas Adoption Project is the best parent-offspring study of IQ that I know of. Remarkably, the narrow-sense heritability was estimated in this study to be 0.78. Probably a tad high. But it really does seem to be the case that the additive genetic variance makes up a large proportion of the total genetic variance in g.

"The heritability of g was estimated to be 0.77"

So, now they are exactly where Sir Cyril Burt was at 40 years ago?

and who amongst us thinks this is going to influence the "throw more money at education/ schools/ family counseling/ other statist solutions- crowd" one iota ???

religious beliefs are thusly so for a reason - they defy reason

Vic, the crowd you speak of, (to which I tend to be sympathetic,) would say that the relevant correlation would be educational resources invested (and family environment) against life success. IQ does predict life success, (and according to this study, is not correlated to the family environment scale) but not strongly enough to justify your dismissal without other arguments.