Agreed. Admittedly I only scanned the paper, however it did appear to attempt to compare a large number of disparate measures in different countries which makes

Agreed. Admittedly I only scanned the paper, however it did appear to attempt to compare a large number of disparate measures in different countries which makes teasing-out the valid comparisons quite a taxing task.... Nevertheless, from other reports in the past few years, it appears that the rises in IQ widely observed during the 20th century (the Flynn effect) have not continued into the 21st. This would possibly argue that improvements in childhood and general health were large contributors to the Flynn effect.