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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

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?
Read more about the article It’s not just sperm quality decline

It’s not just sperm quality decline

  • Post author:Emil O. W. Kirkegaard
  • Post published:23. February 2023
  • Post category:Medicine/Physiology

Recently Scott Alexander wrote a long piece in his usual fashion Declining Sperm Count: Much More Than You Wanted To Know. He takes the usual meta-skeptical rationalist approach of reviewing…

Continue ReadingIt’s not just sperm quality decline
Read more about the article Book review: What We Owe the Future, 2022, by William MacAskill

Book review: What We Owe the Future, 2022, by William MacAskill

  • Post author:Emil O. W. Kirkegaard
  • Post published:5. October 2022
  • Post category:Book review/intelligence / IQ / cognitive ability/Reproductive genetics

While I am no longer the philosophy blogger I once was, I do occasionally read philosophy that's got something to do with science. I saw some references to this book…

Continue ReadingBook review: What We Owe the Future, 2022, by William MacAskill
Read more about the article Book review: At Our Wits’ End (Ed Dutton, Michael Woodley, 2018)

Book review: At Our Wits’ End (Ed Dutton, Michael Woodley, 2018)

  • Post author:Emil O. W. Kirkegaard
  • Post published:31. July 2022
  • Post category:Genetics / behavioral genetics/intelligence / IQ / cognitive ability/Linguistics/language

I try to read many different kinds of books each year. Outside of my own fields, I try to consume high quality popular science, but mainly read academic books within…

Continue ReadingBook review: At Our Wits’ End (Ed Dutton, Michael Woodley, 2018)
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