Witty&Jenkins 1936 confirmed and debunked
There's a really old study that is sometimes brought up. It was covered in depth by John Fuerst and HBD.info. I think Nisbett 2009 (Intelligence and how to get it,…
Male hair loss treatments: I think they work
Being the go-to science guy, I get questions like: so can something be done about my hair loss? The context of this is that I frequently talk about replication crisis,…
New paper out: Europeans Have Larger Testes than Sub-Saharan Africans but Lower Testosterone Levels
Together with Ed Dutton and Helmuth Nyborg: Dutton, E., Nyborg, H., & Kirkegaard, E. O. W. (2022). Europeans Have Larger Testes than Sub-Saharan Africans but Lower Testosterone Levels. Mankind Quarterly,…
How many people can solve this kind of problem?
There's a thread on 4chan that's been spread all over Twitter, Reddit etc.. It concerns some guy who supposedly worked with inmates and reports how poorly they are able to…
IQ can be increased by more education but can intelligence? Does it matter?
Maybe you are thinking: wait I thought IQ was more or less the same as intelligence? IQ tests do measure intelligence well, right? Well, sometimes it is, sometimes it is…
More waves in longitudinal studies do not help against initial sampling error
Suppose you ran 20 studies. By coincidence, one of them attains p < .05 and, by good fortune, it's in the right direction too. The other studies get thoroughly examined…
Supersize me failed replication. Well sort of.
Most people people my age know about a documentary called Supersize me! from 2004. The story of it goes like this: As the film begins, Spurlock is in physically above…
The Unz compositional data fallacy
Readers may recall that about 12 years ago, Ron Unz (of Unz.com) posted an article The Myth of Hispanic Crime. In this article he tried to show that Hispanics were…
Loving your family members too much
Most people know that married couples tend to be more similar than expected by chance for many attributes whether age, race, politics, intelligence, personality, music taste and so on. This…
Ukrainians in our countries: what are we getting, what can we expect?
As the war rages on, the war refugees are starting to come and more are announced. They are being widely accepted even by the nationalist parties. For instance, Danish New…