The study was done in Japan, which in addition to the usual considerations about populations that may have a confounding bias with regard to educational attainment and cognitive performance, is magnified considering that we have a fairly homogeneous society generally averse to immigration, so finding subjects with geographically distant parentages within this population is going to yield a cohort that is unique in a lot of ways perhaps not accounted for in this model.
On the other hand, scientific data that seems to assert a positive correlation between finding a mate outside your local prefecture or even country, and smarter taller and more successful kids, could be an extremely sly way of trying to influence a reversal of Japan's abysmally declining birth rate.
And how does one not imply the other, or are you suggesting that one parent born in County Cork of its native stock, and the other born in Hokkaido are going to have just as likely a chance at the same genetic distance as both parents born in the same geographic region?
People in nearby villages in sub-saharan Africa are likely more diverse than people on different continents outside. People outside Africa are remarkably inbred (the bottleneck is measured in a few thousands at most).
We’re reliably informed that race has no biological basis and differences are greater within groups than between them, so isn’t the answer obviously yes?
Height correlates with a lot of traits that are generally considered desirable, including IQ, rated romantic attractiveness, social success, and income.
Where does it say the study was done in Japan? Author aren't, first four quoted papers aren't? Only 1 paper is referencing Japan, cohort related table seems to be European heavy based, did I miss something?
I definitely got ahead of myself, you are correct there is nothing to suggest that this study was done using subject data drawn in its majority or even a substantial fraction feom Japanese populations. I noted the affiliation with the Biobank Japan project and hastily assumed that this was the primary source of data for the study.
Given that this would only be interesting in the context of the unusually homogeneous in a Japanese sample, and the consequent difficulty in compensating for this with data thus sourced, my original comment is no longer meaningful. Unfortunately its no longer possible to delete it.
On the other hand, scientific data that seems to assert a positive correlation between finding a mate outside your local prefecture or even country, and smarter taller and more successful kids, could be an extremely sly way of trying to influence a reversal of Japan's abysmally declining birth rate.