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IQ scores have been falling for decades, and a new study blames schools and nutrition

from USA Today

Environmental factors such as health and education played a role in both the rise in IQ scores during the 20th century, as well as a long-term decline dating back to the mid-'70s, a study from Norwegian researchers suggests. The study focuses on the Flynn effect, a term used to describe the steady rise in IQ scores during the 20th century. IQ scores started trending downward after 1975, the study shows. Researchers with Oslo's Ragnar Frisch Center for Economic Research studied scores from more than 730,000 men between 1962 and 1991 who participated in military conscription testing. Researchers then narrowed down to focus on families with brothers to determine whether genetics or environmental factors played a greater role in IQ scores. more

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