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linked summaries draw conclusions that aren't even close to being supported by the data

How so? Of course it's true that pop-sci coverage tends to overstate study findings.

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the described data doesn't get us past the conclusion of "not all of it".

I think the described data, which show that the "greater variability and more male math whizzes" argument simply does not hold in all countries or all groups, is pretty clear. Of course, it's true that it doesn't get us to a place where we know there is NO sex-based biological variability in math ability. That would be very hard to prove.