Do gun ownership predict homicides taking race into account?
You may have seen a plot like this one: The reader is left to interpret that guns cause homicides. It's correct if we include suicides but it's not true for…
Meta-Analysis of American Race Differences in Intelligence
So our new meta-analysis of the American race gaps in IQ is published! Kirkegaard, E. & Jensen, S. (2025). Meta-Analysis of American Race Differences in Intelligence. Mankind Quarterly, 66(2), 290-300.…
“Cultural Differences in Response to Pain” revisited
I was sent this viral image about ethnicity and pain management: Tracing the source of this, it comes from a 2017 blogpost, which cites an article in NYPost. The complaints…
African beauty
A friend sent me this study yesterday, so let's cover it here: Taddess, B., Zhang, L., & Trejo, S. (2025). Leveraging Genomic Data to Document Within-Race Attractiveness Penalties Among Black…
Reaction time based intelligence measurements and race differences
There's a wide variety of different ways to measure (general) intelligence, or what researchers call g. One can estimate vocabulary size, query about verbal analogies, general knowledge, ask people to…
Group differences on the Wonderlic short IQ test
I have written a couple of times about how to measure intelligence well and in a short time. Mainly I was interested in which single type of item is best…
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…
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…
Sasha Gusev won’t answer basic questions about his beliefs
Sasha Gusev is a statistical geneticist who spends a lot of time on Twitter. He has been attacking various behavioral genetics studies lately, thus earning some ire from people in…
New paper out: Honesty, Intelligence, and Race
Together with Sebastian Jensen, I have a new paper out: Jensen, S., & Kirkegaard, E. O. W. (2023). Honesty, Intelligence, and Race. OpenPsych, 1(1). https://doi.org/10.26775/OP.2023.07.17 Research shows that honesty correlates…