I wish trends like the Flynn effect (rise in IQ in most of the world throughout the 20th century, including China [0], Japan and Korea [1]) had more concrete an

I wish trends like the Flynn effect (rise in IQ in most of the world throughout the 20th century, including China [0], Japan and Korea [1]) had more concrete answers by now. AFAIK we still don't have any answers beyond conjectures. To me, having a better understanding of this is vital, because IQ is currently in decline in many developed countries, even when you account for immigration and demographic/race changes. Something in our environment is causing a reverse Flynn effect [2] [3], we don't know what it is, and not enough people seem to care. [0] - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3834612/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3834612/ [1] - https://www.sciencedirect.com/science/article/abs/pii/S0191886911001437 https://www.sciencedirect.com/science/article/abs/pii/S01918... [2] - https://www.nbcnews.com/think/opinion/iq-rates-are-dropping-many-developed-countries-doesn-t-bode-ncna1008576 https://www.nbcnews.com/think/opinion/iq-rates-are-dropping-... [3] - https://www.pnas.org/doi/pdf/10.1073/pnas.1718793115 https://www.pnas.org/doi/pdf/10.1073/pnas.1718793115