Why are our IQs Falling?

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It turns out that for the last couple decades IQ scores have been falling in developed nations. So we wanted to unpick what's happening and some of the reasons which could explain this falling intelligence level...

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1 - https://en.wikipedia.org/wiki/Intelligence_quotient#Current_tests
2 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8659667/
3 - https://www.who.int/news-room/questions-and-answers/item/nutrition-effects-of-iodine-deficiency
4 - https://pubmed.ncbi.nlm.nih.gov/8162884/
5 - https://psycnet.apa.org/record/1969-08119-001
6 - https://www.sciencedirect.com/science/article/abs/pii/S0160289615000082
7 - https://www.psu.edu/news/research/story/more-school-more-challenging-assignments-add-higher-iq-scores/
8 - https://www.statista.com/statistics/236087/us-school-enrollment-rates-by-age-group/
9 - https://www.sciencedirect.com/science/article/abs/pii/S0160289615000082
10 - http://www.iapsych.com/iqmr/fe/LinkedDocuments/dutton2013.pdf
11 - https://www.sciencedirect.com/science/article/abs/pii/S0160289607000189
12 - https://www.sciencedirect.com/science/article/abs/pii/S0160289604000522
13 - https://www.sciencedirect.com/science/article/abs/pii/S0160289612001055
14 - http://www.iapsych.com/iqmr/fe/LinkedDocuments/dutton2013.pdf
15 - https://www.sciencedirect.com/science/article/abs/pii/S0160289617302787
16 - https://worldpopulationreview.com/country-rankings/average-iq-by-country
17 - https://www.nas.org/blogs/article/education_and_intelligence-part_4_the_flynn_effect
18 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6042097/
19 - https://global.oup.com/academic/product/toxic-cocktail-9780190260934