Thinking and deciding are central to our daily lives. The Less Wrong community aims to gain expertise in how human brains think and decide, so that we can do so more successfully.

We use insights from cognitive science, social psychology, probability theory, and decision theory to improve our understanding of how the world works and what we can do to achieve our goals.

Want to know if your doctor's diagnosis is correct? It helps to understand Bayes' Theorem.

Want to make a plan for achieving your goals? It helps to know the ways in which we don't know our own desires.

Want to make the world a better place? It helps to know about the cognitive bias called 'scope insensitivity', and that some charities are more efficient than others.

We discuss and practice these skills on the main blog (, in the discussion area, and in regular meetups around the world.

This group is a real-life instantiation of the online Less Wrong community in and around Ottawa (Canada). Come meet us if you're in the area.

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Recent Meetups

  • May 20, 2014 · 7:00 PM

    Applied Rationality Series: The Value of Information

    4 Aspiring rationalists | 5.00

    We live in a world that's full of information. You can find out almost anything that you want to–at a cost in time, attention, and sometimes money. When is the... Learn more
  • January 28, 2014 · 7:00 PM

    Rationality Dojo

    7 Aspiring rationalists | 4.50

    Join us for the new year installment of our series on applied rationality. Previous sessions have covered the following topics: Rational debating Thinking in Bayes... Learn more
  • January 12, 2014 · 4:00 PM

    Effective altruism

    7 Aspiring rationalists | 5.00

    Many of us seek to help others by supporting charitable causes that we consider important. This is especially true during the holiday season which often inspires an... Learn more
  • November 11, 2013 · 7:00 PM

    Applied Rationality: confidence calibration

    5 Aspiring rationalists | 5.00

    When people are asked to provide confidence estimates along with answers to questions, they are usually overconfident. However, repeatedly making these estimates and... Learn more
  • September 26, 2013 · 7:00 PM

    Applied Rationality: Thinking in Bayes

    10 Aspiring rationalists | 4.00

    The universe runs on math, but math can be hard for some humans. We're predictably wrong on many problems involving probability. Come to the second Applied Rationality... Learn more
  • See all past Meetups

What's new

  • New comment
    Tess F.

    "http://www.­psychosocia­­17/Depressi­ve_Realism_­Hypothesis_­Hussain.htm­l http://en.w­ikipedia.or­g/wiki/Depr­essive_real­ism Though both point out that depressive realism is not consistent,­ positive bias is fairly, and still useful :D"

    Read more…

  • New comment
    Tess F.

    "There is something to be said for overconfide­nce. A lot of stuff happens because people didn't­ know it couldn'­t be done - or was improbable.­..."

    Read more…

  • New Member
    Tess F. Tess F. joined
    November 29
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    Mark Mark joined
    November 28
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    Matt L. Matt L. joined
    October 29
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    October 21
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    October 11
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    JimDavies JimDavies joined
    July 21
    "I'm a cognitive scientist and artist."
  • New Member
    April April joined
    June 24
    "I am just a random person who lives in Ottawa trying to find some fellow thinkers to befriend. Introverted, but with a desire for good minds to interact with."
  • New Member
    Mason Mason joined
    June 22

Ottawa, ON

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