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Read more about the article What explains the Big Pisa Decline of 2022? It’s not COVID

What explains the Big Pisa Decline of 2022? It’s not COVID

  • Post author:Emil O. W. Kirkegaard
  • Post published:1. December 2025
  • Post category:Immigration/intelligence / IQ / cognitive ability

You may have seen posts like this: Two explanations are commonly offered: Phones/computers got suddenly more addictive than before (Tiktok-era) COVID was bad for learning. Let's start with the second.…

Continue ReadingWhat explains the Big Pisa Decline of 2022? It’s not COVID
Read more about the article US BMI/obesity declined, but was it due to GLP-1?

US BMI/obesity declined, but was it due to GLP-1?

  • Post author:Emil O. W. Kirkegaard
  • Post published:21. September 2025
  • Post category:Medicine

In tech circles, there has recently been many people cheering for the apparent success of Ozempic-like drugs (GLP-1 agonists) in finally reducing the American obesity rate. More and more variants…

Continue ReadingUS BMI/obesity declined, but was it due to GLP-1?

What doesn’t explain the post-COVID fertility decline?

  • Post author:Emil O. W. Kirkegaard
  • Post published:13. July 2025
  • Post category:Demographics/Medicine

I've been writing about fertility for a while. Of recent interest is the COVID or post-COVID fertility decline. Birth Gauge compiles the most up to date TFR (total fertility rate)…

Continue ReadingWhat doesn’t explain the post-COVID fertility decline?
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