Now let's try it differently. Even if you feel that 20 articles is too small subset to describe the richness of this site, let's push it even further. Imagine that you can only list 10 articles, or 7 articles, 5 articles, 3 articles, or just 1 single best articles of the LessWrong. It will be painful, but please do your best.
Why? Well, unless one of us puts their selection of 20 articles on the wiki ignoring the others, the resulting selection will be a mix of something that you would select and something that you wouldn't. The resulting 20 articles will contain only 10 or maybe less articles from your personal "top 20" selection. So let's make it the best 10 articles.
However I ask you to avoid using strategies like this: "I think articles A and B are good. A is better than B, so if I have to choose only one article, I should have chosen A. But article A is widely popular, and most other people will probably choose it too, therefore I will pick B, which maximizes the chance that both A and B will be in the final selection." Please avoid this. Just pretend that the remaining articles will be chosen randomly (even if other people have already posted their choices), so you should really choose what you prefer most. Please cooperate on this Prisonner's Dilemma.
Also, please explain your reason behind selecting those articles. Maybe you see an aspect others are missing. Maybe others can suggest you another article which fulfills your goal better. (In other words, if you explain yourself, others can extrapolate your volition.)
My choice, the most important three articles:
If it's worth saying, but not worth its own post, even in Discussion, it goes here.