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@ -16,6 +16,8 @@ IQ (intelligence quotient) is a non-perfect but [still kind of useful](good_enou
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IQ follows the normal [probability](probability.md) distribution, i.e. it is modeled by the [bell curve](bell_curve.md) that says how many people of the total population will fall into any given range of IQ score. Though this has been challenged too, one of the basic laws of human stupidity says that the probability that someone is stupid is independent of any other of his characteristics (education, profession, race, sanity, ...). There are various IQ scales, almost all use the Gaussian (bell) curve that's centered at 100 (i.e. 100 is supposed to mean the average intelligence) and have [standard deviation](standard_deviation.md) 15 (but other have been used as well) -- this is what we'll implicitly suppose in the article from now. This means that about 2/3rds of people will fall in the range 85 to 115 but no more than 1% will have IQ higher than 145 or lower than 55. Sometimes you may also encounter so called **percentile** which says what percentage of population is below your IQ.
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**Average global IQ is decreasing**, according to https://www.fourmilab.ch/documents/IQ/1950-2050/ it dropped from 91.64 in 1950 to 88.08 in 2020. Reasons for this may range from wider spread of [capitalism](capitalism.md), [feminism](feminism.md) and similar brain diseases to rapidly increasing poverty as well as more brainwashing (ads, [soyence](soyence.md) propaganda etc.) etc.
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TODO: more details, history, where to measure (web vs Mensa vs SAT etc.)
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```
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