Hello, Less Wrong.
Like some others, I eventually found this site after being directed by fellow nerds to HPMOR. I've been working haphazardly through the Sequences (getting neck-deep in cognitive science and philosophy before even getting past the preliminaries for quantum physics, and loving every bit of it).
I can't point to a clear "aha!" moment when I decided to pursue the LW definition of rationality. I always remember being highly intelligent and interested in Science, but it's hard for me to model how my brain actually processed information that long ago. Before high school (at the earliest), I was probably just as irrational as everyone else, only with bigger guns.
Sometime during college (B.S. in mechanical engineering), I can recall beginning an active effort to consider as many sides of an issue as possible. This was motivated less from a quest for scientific truth and more from a tendency to get into political discussions. Having been raised by parents who were fairly traditional American conservatives, I quickly found myself becoming some kind of libertarian. This seems to be a common occurrence, both in the welcome comments I've read here and elsewhere. I can't say at this point how much of this change was the result of rational deliberation and how much was from mere social pressure, but on later review it still seems like a good idea regardless.
The first time I can recall actually thinking "I need to improve the way I think" was fairly recent, in graduate school. The primary motivation was still political. I wanted to make sure my beliefs were reasonable, and the first step seemed to be making sure they were self-consistent. Unfortunately, I still didn't know the first thing about cognitive biases (aside from running head-on into confirmation bias on a regular basis without knowing the name). Concluding that the problem was intractable, I withdrew from all friendly political discussion except one in which my position seemed particularly well-supported and therefore easy to argue rationally. I never cared much for arguing in the first place, so if I'm going to do it I'd prefer to at least have the data on my side.
I've since lost even more interest in trying to figure out politics, and decided while reading this site that it would be more immediately important anyway to try figuring out myself. I've yet to identify that noble cause to fight for (although I have been interested in manned space exploration enough to get two engineering degrees), but I think a more rational me will be more effective at whatever that cause turns out to be.
Still reading and updating...
Welcome to LW!
I like the "just with bigger guns" metaphor a lot; the trouble with intelligence is its ability to produce smart-seeming arguments for nearly any silly idea.
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
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* 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:
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.)