Its a side effect about the differences in education. IQ is relative to the population and education, they slightly increase it to keep the average around 100. The average person 100 years ago had 30 less IQ points, because education and child nutrition were non existent. Cut those things and your average person reverts back.

Other countries have only gotten better, the US has just gotten worse.

[–] GoodLuckToFriends@lemmy.today 3 points 9 hours ago (1 children)

they slightly increase it to keep the average around 100

They don't "slightly increase it to keep the average around 100." The average is defined as 100. https://en.wikipedia.org/wiki/Standard_score https://en.wikipedia.org/wiki/IQ_classification

[–] kevin2107@lemmy.world 2 points 8 hours ago (1 children)

My explanation is for laymen, 100 in 2025 is not the same 100 in 1925, my point.

[–] UnderpantsWeevil@lemmy.world 1 points 8 hours ago

Lots of people who talk about IQ don't know what the Q stands for.