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Astral Codex Ten

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Astral Codex Ten is a popular Substack newsletter and blog focusing on rationalist and effective altruism communities. Founded by psychiatrist Scott Alexander after the closure of his previous blog, Slate Star Codex, it serves as a central hub for discussions on science, philosophy, politics, and technology. The blog is known for its long-form analytical essays, open threads, and its role in contemporary intellectual discourse.

History and background

The blog was launched in early 2021 following the high-profile shutdown of its predecessor, Slate Star Codex, which occurred after a controversial New York Times article. This event sparked significant debate within online communities about journalistic ethics and doxxing. The author, Scott Alexander, a psychiatrist based in the San Francisco Bay Area, transitioned the readership to the new platform. The launch was supported by prominent figures in the rationalist community, including Eliezer Yudkowsky of the Machine Intelligence Research Institute and Peter Thiel, reflecting its roots in Silicon Valley intellectual circles.

Content and themes

Essays typically explore interdisciplinary topics, blending insights from psychiatry, statistics, economics, and history. Recurring themes include Bayesian reasoning, utilitarianism, cognitive biases, and analyses of social trends. The blog frequently reviews academic papers, such as those from The Lancet or Proceedings of the National Academy of Sciences, and engages with works by thinkers like Robin Hanson and Bryan Caplan. Notable series have examined concepts like Moloch, simulation hypothesis, and gene-culture coevolution, often referencing historical events like the Thirty Years' War or philosophical traditions from the Enlightenment.

Influence and reception

It has developed a substantial following among academics, technologists, and policymakers, influencing discussions within the effective altruism movement and organizations like the Centre for Effective Altruism and Open Philanthropy. Its posts have been cited in venues like The Atlantic and Bloomberg News, and it has shaped debates on AI safety, particularly concerning research at DeepMind and the Future of Humanity Institute. The annual ACX Grants program, funded by readers, distributes money to small-scale research and charitable projects, further extending its practical impact.

The blog's ecosystem includes several spin-offs and collaborative projects. These include the ACX Grants initiative, the Unofficial Annual Survey, and the Book Review Contest. It is closely associated with authors and bloggers within the broader rationalist sphere, such as Zvi Mowshowitz of Don't Worry About the Vase, Julia Galef of the Rationally Speaking podcast, and Sarah Constantin. Its intellectual lineage connects to earlier community hubs like LessWrong, founded by Eliezer Yudkowsky, and the writings of Steven Pinker and Nassim Nicholas Taleb.

The newsletter operates as a subscription-based publication on the Substack platform, which handles its payment processing and content distribution. It maintains a clear legal distinction from the author's professional work in psychiatry. The blog has established policies regarding copyright and fair use, and its ACX Grants program is administered as a separate philanthropic project. Its operational model has been discussed in contexts related to media independence and the creator economy.