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Less Wrong is a community of people who want to have fun and achieve big things. We're passionate about using the latest science to do this, in particular knowledge of cognitive biases - peculiar ways in which our brains consistently lead us astray. We believe that fighting against the truth is almost always harmful, and Less Wrong is a place where all ideas - however controversial or mind-blowing - will get a fair hearing.

Less Wrong started off as an online community and has since emerged in local meetup groups around the world. A great introduction to the philosophy that most of us share can be found here (it's long, but to a particular sort of warped mind, hugely entertaining):

Less Wrong are trying to get to the truth on everything - from the distant future to the inside of our own heads.

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  • May 27 · 1:00 PM

    Slate Star Codex meetup

    7 Rationalists

    [exact topic tbd] SSC is a popular blog on rationality topics (and a whole bunch else). This is the second Toronto meetup of People Who Read Slate Star Codex And Their... Learn more
  • Dec 3, 2015 · 7:00 PM

    Grab bag o' blog posts

    4 Rationalists | 4.00

    might be the theoretical computer science result of the decade David Chapman has an interesting blog/book at Here is his contention that probability... Learn more
  • Oct 15, 2015 · 7:00 PM

    MIRIx: Understanding causal decision theory

    9 Rationalists

    Continuing the decision theory thread... Last time we introduced decision theory, and briefly mentioned causal decision theory. It has some flaws, but it's worth getting... Learn more
  • Oct 1, 2015 · 7:00 PM

    Language and Common Knowledge

    4 Rationalists | 5.00

    Last time's discussion veered off onto the fertile lands of Game theory. Let's explore it further. Perhaps you've read a book like Strategy of Conflict by Thomas... Learn more
  • Sep 17, 2015 · 7:00 PM

    MIRIx: Introduction to decision theory

    16 Rationalists | 4.50

    This meetup's open to everyone, but note that it'll be math-heavy and more structured than our usual Less Wrong format. How would an AI make its decisions? We don't want... Learn more
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  • Giles founded SlateStarCodex-LessWrong Toronto

    on February 8


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