The Open Thread posted at the beginning of the month has gotten really, really big, so I've gone ahead and made another one. Post your new discussions here!
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
What's so intimidating? You don't need much to post here, just a basic grounding in probability theory, decision theory, metaethics, philosophy of mind, philosophy of science, computer science, cognitive bias, evolutionary psychology, the theory of natural selection, artificial intelligence, existential risk, and quantum mechanics - oh, and of course to read a sequence of >600 3000+ word articles. So long as you can do that and you're happy with your every word being subject to the anonymous judgment of a fiercely intelligent community, you're good.
Being able to comment smartly and in a style that gets you upvoted doesn't really need any grounding in any of those subjects. I just crossed 1500 karma and only have basic grounding in Computer Science, Mathematics, and Philosophy.
When I started out, I hadn't read more than EY's Bayes' for Dummies, The Simple Truth, and one post on Newcomb's.
In my opinion, the following things will help you more than a degree in any of the subjects you mentioned: