O wow.
I've been following Lesswrong for months now, and only because of this post did I found out that there's more posts hidden under 'main' than just the promoted ones. So Thanks Elo!
I now wonder if there are any other hidden site features I don't know about.
I have to say this is not very good design. Why would you hide posts in such a non-obvious way. It's also rather inconsistent. The discussion page opens an overview page of newest posts, while the main page shows only a subset of newest posts, and shows the full content instead of an overview. There is apparently a way to get both main and discussion on a single page (see the links Vaniver and ike posted), but then for some reason the overview page is formatted completely differently.
useful feature: the little envelope below comments and posts allows you to follow a post and receive future comments on it in your inbox
There is a post at this link: http://lesswrong.com/lw/mp3/proper_posture_for_mental_arts/
It does not appear in my discussion feed. See the timestamps in the pictures below:
and:
It's currently 0900 local time on the 1/9/15. The only reason that I can think of this being wrong is that its a timezone publishing effect. But I don't know how, or what to do about it...
It also does not appear in an incognito window view of the discussion.
Now what?