Welcome to LessWrong!


LessWrong was founded in 2009 and relaunched in 2018 with a new codebase and full-time team.

We are a community dedicated to improving our reasoning and decision-making. We seek to hold true beliefs and to be effective at accomplishing our goals. More generally, we work to develop and practice the art of human rationality.[1]

To that end, LessWrong is a place to 1) develop and train rationality, and 2) apply one’s rationality to real-world problems.

LessWrong serves these purposes with its library of rationality writings, community discussion forum, open questions research platform, and community page for in-person events.

To get a feel for what LessWrong is about, here’s a selection of LessWrong posts which might appeal to you:

Check out this footnote[2] below the fold for samples of posts about AI, science, philosophy, history, communication, culture, self-care, and more.

If LessWrong seems like a place for you, we encourage you to become familiar with LessWrong’s philosophical foundations. Our core readings can be be found on the Library page.

We especially recommend:

Find more details about these texts in this footnote[3]

For further getting started info, we direct you to LessWrong’s FAQ. Lastly, we suggest you create an account so you can vote, comment, save your reading progress, get tailored recommendations, and subscribe to our latest and best posts. Once you've done so, please say hello on our latest welcome thread!


LessWrong FAQ

A Brief History of LessWrong


  1. Rationality is a term which can have different meanings to different people. On LessWrong, we mean something like the following:  

    • Rationality is thinking in ways which systematically arrive at truth.
    • Rationality is thinking in ways which cause you to systematically achieve your goals.
    • Rationality is trying to do better on purpose.
    • Rationality is reasoning well even in the face of massive uncertainty.
    • Rationality is making good decisions even when it’s hard.
    • Rationality is being self-aware, understanding how your own mind works, and applying this knowledge to thinking better.

    See also: What Do We Mean By "Rationality"?, Why Spock is Not Rational, What are the open problems in Human Rationality? ↩︎

  2. More sample posts from LessWrong:  

  3. More details about our core readings:

    Rationality: A-Z is a deep exploration of how human minds can come to under the world they exist in - and all the reasons they so commonly fail to do. The comprehensive work:

    The Codex collects Scott Alexander's writings on good reasoning, what we can learn from the institution of science, and the different ways society could be and has been organized. Exemplary essays include:

    Harry Potter and the Methods of Rationality started as a side project of Eliezer’s and grew to be one of the most highly rated Harry Potter fanfictions of all time and an an excellent primer on rationality. Eliezer imagined an alternate-universe Harry Potter who grew up with loving adopted parents, one of them an Oxford scientist. He enters the wizarding world with a scientific and rationalist mindset. Click here to read HPMOR through LessWrong or try the audiobook. ↩︎