Can you only talk to people within X IQ of your own?
There is this claim sometimes seen when discussing highly gifted people. One interested reader emailed me to ask where it was that Arthur Jensen made this claim: Anyway, what I…
Autistic children attend a course delivered by a specialised teacher Caroline Berge (L) at the College du Parc in Aulnay-sous-Bois, northeast of Paris on October 9, 2019. (Photo by Christophe ARCHAMBAULT / AFP) (Photo by CHRISTOPHE ARCHAMBAULT/AFP via Getty Images)
Autism diagnoses are rising, yes, but autism, probably not
We can read in many outlets that the reason autism is increasing in prevalence is that clinicians are becoming more aware of it. The idea being that autism was already…
New study: Intelligence and Group Differences in Preference for Breasts over Buttocks
George Francis and I have a new exciting study out, the formal and finalized version of George Francis' 2022 blogpost: Francis, G., & Kirkegaard, E. O. W. (2023). Intelligence and…
New study out: Systemic Racism Does Not Explain Variation in Race Gaps on Cognitive Tests
The new issue of Mankind Quarterly just came out. It appears I have no less than 6 pieces in this, so let's get started. Kirkegaard, E. O. W. (2023). Systemic…
Money and crime: the relationship that wasn’t
There must be 10,000s of studies and news articles reporting findings that wealth or income is negatively related to crime. In other words, poverty causes crime. The popular theory being…
If cities are bad, why do people move there?
This is a natural follow-up to my prior post about fertility, and how cities (or population density in some sense) cause fertility to decline. In fact, cities seem to be…
Measurement error and group differences explained
I have often talked about how measurement error impacts correlations between two variables. Here we are talking about classical measurement error, which is theoretically understood as adding a normally distributed…
Fertility questions: the role of population density?
There is a worldwide decline in fertility: The COVID-19 years seem to have been particularly bad on some countries. The poster child for future problems is South Korea: Even Reuters…
My conversion story, or a brief autobiography
I sometimes get asked how it is that I got into this unusual field. Of course, as with all autobiographies, there will be some distortions and poor memory along the…
The role of censorship in science
A new many-author paper makes the case that censorship is rampant in science: Clark, C. J., Jussim, L., Frey, K., Stevens, S. T., Al-Gharbi, M., Aquino, K., ... & von…
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