Here's another snippet for you. I trawled this quote up earlier-
So what's causing that, Cal? Is the world getting whiter?
However, the recent trend that IQ has increased by at least 15 points in the last 30 years poses alarming problems for IQ theorists. Even though the effect of parental IQ is still robust, the effect is no longer an absolute effect and there are not as yet a satisfactory explanation as to why the population IQ is generally increasing.
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