What like?
When it comes to general concepts cybernetics is something to which a lot of people on LW don't have much exposure and cybernetics as central as knowing probability theory for understanding how the world works.
Basically any subject in which I invested a decent amount of thought produces lessons that are applicable to other topics. I even learned a lot in an activity like Salsa dancing that's useful in other contexts.
Another month has passed and here is a new rationality quotes thread. The usual rules are: