Anthropic Ads, Language Doublets, and History LLMs

[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 see them, and will highlight important corrections later, but I can't guarantee I will have caught them all by the time you read this.]

https://www.astralcodexten.com/p/links-for-february-2026