IQ rates are dropping in many developed countries ( Scandinavia, Britain, Germany, France and Australia). Around the turn of the 21st century, many of the most

IQ rates are dropping in many developed countries ( Scandinavia, Britain, Germany, France and Australia). Around the turn of the 21st century, many of the most economically advanced nations began experiencing some kind of decline in IQ. We can rule out some explanations: - US only explanations don't work. - Not genetics. It's not immigrants or low IQ people having more children. Norwegian studies show that children of high-IQ parents are also having lower IQ.Flynn effect and its reversal are both environmentally caused https://www.pnas.org/content/pnas/115/26/6674.full.pdf https://www.pnas.org/content/pnas/115/26/6674.full.pdf So its environment somehow. Nutrition, exercise, education, activities, pollution, ...