[I haven’t independently verified each link. On average, commenters will end up spotting evidence that around two or three of the links in each links post are wrong or misleading. I correct these as I ...

A recent poll finds that 39% of young people “feel uncertain” about having children because of climate change. And sure, people say a lot of things on polls, but people seem to be talking about this ...

And I’ll try to post my Oakland guide tomorrow. 2: New meetups for the coming month: Berkeley, Beijing, and Kansas City. Check the meetup list for details.

A friend asked me to investigate the following mystery: why do 5-10% of skulls from 10,000 BC to 3,000 BC, all over the world, have holes in them? Why do bone growth patterns indicate that most ...

This is the weekly visible open thread. Post about anything you want, ask random questions, whatever. ACX has an unofficial subreddit, Discord, and bulletin board, and in-person meetups around the ...

[Sneak Peek] Declining Sperm Count: Much More Than You Wanted To Know ... Scott Alexander ...

[This is one of the finalists in the 2026 book review contest, written by an ACX reader who will remain anonymous until after voting is done. I’ll be posting about one of these a week for several ...

…is one of my favorite parts of this blog. I get a spreadsheet with what are basically takes - “Russia is totally going to win the war this year”, “There’s no way Bitcoin can possibly go down”. Then I ...

Many cities have regular Astral Codex Ten meetup groups. Twice a year, I try to advertise their upcoming meetups and make a bigger deal of it than usual so that irregular attendees can attend and new ...

Many cities have regular Astral Codex Ten meetup groups. Twice a year, I try to advertise their upcoming meetups and make a bigger deal of it than usual so that irregular attendees can attend and new ...

Here’s a topographic map of California (source): You might notice it has a big valley in the center. This is called “The Central Valley”. Sometimes it also gets called the San Joaquin Valley in the ...