Want children? Marry a telemarketer or maid, avoid librarians and web developers
In a world of declining fertility, we have to ask ourselves why? I've spent many posts on that question. We could also ask instead, how do I avoid this happening…
Tracking ancestry and social inequality using American surnames
Our big project was finally published: Van Pelt, D., & Kirkegaard, E. O. (2026). Big Data, Deep Roots: Correlating Surname Genetic Ancestry and Socioeconomic Status across Millions of Americans. Comparative…
Skin color and intelligence in Latin America
Skin color (lightness or brightness) has been used as a proxy for genetic ancestry for over 100 years. It works alright in many cases. Take this study (Parra et al…
Race, intelligence, and inequality in Brazil
Many years ago I discovered that Brazil publishes the subject level data for many scale testing efforts. These also come with rich surveys concerning the children's homes. The main tests…
Race and social inequality in France
France is the 4th most populous country in Europe these days (it used to be number 1 before it had early secularization). It is also quite insular when it comes…
Genetic evidence of Ashkenazi intelligence
There are long standing questions about the source of Jewish achievement. Most of this achievement relates to the Ashkenazi subgroup, less so the other Jews. This tells us that the…
Explaining economic growth since 2000
Some days ago I posted some cumulative growth charts for OECD countries, like this one: These results are somewhat affected by the usual GDP issues relating to tax haven (Ireland…
Free speech for thee but not for me
Most countries have severe limitations on free speech. Historically, freer speech was a characteristic of western countries, but not so much anymore, with the exception of the United States. And…
Leftism, mental health, and visual presentation confirmed
So we did another study of leftism, mental health and visual presentation: Hu, M.,& Kirkegaard, E. O. W.(2026). Left-wing ideology, mental health and body modifications. Journal of Open Inquiry in…
Migration and feelings of safety in Denmark
A politician from the Social Democrats called Frederik Vad (center-left government party) posted results of a survey about how safe citizens report feeling in various areas of the country. There…
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