An Open Thread: a place for things foolishly April, and other assorted discussions.

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.

Update: Tom McCabe has created a sub-Reddit to use for assorted discussions instead of relying on open threads.  Go there for the sub-Reddit and discussion about it, and go here to vote on the idea.