So? It's like height, then? http://www.newyorker.com/magazine/2004/04/05/the-height-gapAbout 75% of whatever it is that IQ is measuring, is inherited. Some studies suggest 85%.
Height variations within a population are largely genetic, but height variations between populations are mostly environmental, anthropometric history suggests. If Joe is taller than Jack, it’s probably because his parents are taller. But if the average Norwegian is taller than the average Nigerian it’s because Norwegians live healthier lives
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Any decent diet can send us sprouting at these ages, but take away any one of forty-five or fifty essential nutrients and the body stops growing. (“Iodine deficiency alone can knock off ten centimetres and fifteen I.Q. points,” one nutritionist told me.)
So as I assumed, you are using modern IQ tests.michael said:And guess what - when you measure a bunch of people, in a group, you can determine the average of that group. In Japan, for example, the average is 105. They have a functioning democracy. In Swedenstan, the average is 99. They have a functioning democracy - for now. In Syria, the average IQ is 83. They're ruled by a dictator. In ultra rich KSA it's 84, they live in a Theocracy.
Look, you can argue with the evidence all day long. It is what it is.
They have been adjusted by 2-3 points per decade, to account for the Flynn Effect. Recalibrated. That's how Flynn discovered the effect - he noticed the significance of the continual recalibrations that had been necessary to keep the median score at 100.
The modern 105 scoring Japanese would have crossed the line into modern 95 point territory at the earliest in the 1960s and more likely in the 1980s, the Swedes in the 1970s or '80s, and so forth.
As far as I can think of off hand, not a single modern functioning democracy was founded among people whose average score on a modern IQ test was higher than 90. Can you think of any exceptions?
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