A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
* Normal_Anomaly
* Randaly
* shokwave
* Barry Cotter
A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
- Your Intuitions are Not Magic
- The Apologist and the Revolutionary
- How to Convince Me that 2 + 2 = 3
- Lawful Uncertainty
- The Planning Fallacy
- Scope Insensitivity
- The Allais Paradox (with two followups)
- We Change Our Minds Less Often Than We Think
- The Least Convenient Possible World
- The Third Alternative
- The Domain of Your Utility Function
- Newcomb's Problem and Regret of Rationality
- The True Prisoner's Dilemma
- The Tragedy of Group Selectionism
- Policy Debates Should Not Appear One-Sided
- That Alien Message
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site.
(Note from orthonormal: MBlume and other contributors wrote the original version of this welcome message, and I've stolen heavily from it.)
It varies, and I might not even know. For example, if the arrangement of signs on a particular street intersection causes unnecessary traffic congestion, I might call it an irrational arrangement. In doing so I'd be presuming that whoever chose that arrangement intended to minimize traffic congestion, or at least asserting that they ought to have intended that. But I might have no idea who chose the arrangement. (I might also be wrong, but that's beside the point.)
But that said, and speaking very roughly: irrationality on the part of the most proximal agent(s) who was (were) capable of making a different choice.
Yes, it is.
For example, what I just described above is a form of metonymy... describing the streetsign arrangement as irrational, when what I really mean is that some unspecified agent somewhere in the causal history of the streetsign was irrational. Metonymy is a common one among humans, and I find it entertaining, and in many cases efficient, and those are also virtues I endorse. But it isn't a straightforward form of communication, you're right.
Incidentally, I suspect that most uses of 'rationality' on this site (as well as 'intelligence') could be replaced by 'optimization' without losing much content. Feel free to use the terms that best achieve your goals.