Couldnt get a clear grip on your interests from your feed, so came here to say this too. Also markets ( #invisibleHand - theory of moral sentiments, and the wealth of nations) , #qualityControl, and #openBSD, I reckon. I'm delving these at the moment and it's super interesting. Also Enterprise Resource Planning software suites (specifically #ERP5 but it might prove too deep for my delving ability) and sometimes #cybernetics (which goes back to #mathematical #complexity and #communicationTheory ).