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An interactive version of the extropians mailing list

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2026·LessWrong·lesswrong.com/posts/hTnhwX9kr6GHgFrp4/an-interactive-vers...

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beyarkay

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3/5
Good(3)

Good quality. Reputable source with community review or editorial standards, but less rigorous than peer-reviewed venues.

Rating inherited from publication venue: LessWrong

This tool archives the Extropians mailing list, a 1990s intellectual community that prefigured many modern AI safety concerns and included early contributions from key figures in the field; useful for historical research.

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History of RationalityCommunityWorld Modeling

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Importance: 25/100tool

Summary

This LessWrong post presents an interactive interface for exploring the historic Extropians mailing list archive, allowing users to search and browse early transhumanist and proto-AI-safety discussions from the 1990s. The Extropians list was a foundational community where many ideas around AI risk, mind uploading, and technological acceleration were first debated. This tool makes that intellectual history more accessible.

Key Points

  • •Provides an interactive, searchable interface for the Extropians mailing list archives from the 1990s
  • •The Extropians community was a precursor to modern AI safety and rationalist communities, discussing many overlapping themes
  • •Allows researchers to trace the intellectual genealogy of ideas around AI risk, transhumanism, and long-term futures
  • •Historically significant as a venue where figures like Nick Bostrom, Eliezer Yudkowsky, and others participated in early discussions
  • •Useful for understanding how current AI safety and existential risk discourse evolved from earlier transhumanist thought

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HTTP 200Fetched Apr 7, 20263 KB
# An interactive version of the extropians mailing list
By beyarkay
Published: 2026-03-18
Claude & I vibecoded an interface for the extropians mailing list. It’s live! Have a look here: [https://extropians.boydkane.com/](https://extropians.boydkane.com/).

![](https://boydkane.com/assets/extropians-embeddings.png)

From [Wikipedia](https://en.wikipedia.org/wiki/Extropianism#Extropy_Institute), discussing the extropians mailing list:

> In the 90s, the Extropy Institute launched an email mailing listserv through which members could receive updates from the institute and have conversations about extropianism with other members. Notable members include:
> 
> *   Julian Assange
> *   Nick Bostrom
> *   Wei Dai
> *   Eric Drexler
> *   Hal Finney
> *   Robin Hanson
> *   Todd Huffman
> *   Marvin Minsky
> *   Ray Kurzweil
> *   Nick Szabo
> *   Eliezer Yudkowsky

I got curious about this mailing forum. There’s an index hosted by one of the original participants [Wei Dai](https://en.wikipedia.org/wiki/Wei_Dai)  [here](http://extropians.weidai.com/), but it’s not easy to navigate, and there’s a dump of all the data [here](https://github.com/macterra/extropians) but that’s just the raw data.

There’s 130k messages spread out over ~8 years from 2k unique authors, discussing topics including mars, cryonics, nanotech, morality, AI, politics, etc.

![](https://boydkane.com/assets/extropians-front-page.png)

I also took the time to embed all 130k messages and then project them via UMAP:

![](https://boydkane.com/assets/extropians-embeddings.png)

If you hover over a message, it’ll highlight the other messages in that thread:

![](https://boydkane.com/assets/extropians-embeddings-thread.png)

This is just running on a smol server, so there’s no semantic search, but I did pre-cluster the embeddings and label them, so you can search for specific clusters.

![](https://boydkane.com/assets/extropians-cluster-search.png)

All messages also have tags (that are just based on keywords) so you can filter by that as well.

You can view message threads:

![](https://boydkane.com/assets/extropians-message-thread.png)

Or the messages sent by a particular author (I’ve also linked their Wikipedia/personal website when appropriate):

![](https://boydkane.com/assets/extropians-author-page.png)

Most of the links have rot in the past 20 years, so all URLs have a box emoji 📦 that’ll take you to the wayback machine to see if there’s an archived version.

Most mailing lists would explicitly quote who they were responding to, so I’ve tidied that up a little bit:

![](https://boydkane.com/assets/extropians-quote.png)

And finally, because the times and jargon have changed (e.g. GMI - Guaranteed Minimal Income), there’s a glossary:

![](https://boydkane.com/assets/extropians-glossary.png)

Which will give you definitions on hover for those words in the glossary:

![](https://boydkane.com/assets/extropians-glossary-on-hover.png)

I hope this is interesting to at least some of you, I

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