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.<p>We can rule out some explanations:<p>- US only explanations don't work.<p>- 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 <a href="https://www.pnas.org/content/pnas/115/26/6674.full.pdf" rel="nofollow">https://www.pnas.org/content/pnas/115/26/6674.full.pdf</a><p>So its environment somehow. Nutrition, exercise, education, activities, pollution, ...