Especially interesting to put all of that in the context of recent reports of plateaus and reversals in the Flynn Effect, at least in certain European countries: (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6042097/), contrasted with wider meta-analyses that still show an increase, although less than previously thought, and dependent on age group and country development status. (https://www.sciencedirect.com/science/article/abs/pii/S01602...)