History. The history of my area, my country, my planet. The history of the different sciences, of different cultures, of warfare, agriculture, medicine. The history of just about everything. Today, it's almost taken for granted our society can and will change dramatically every decade. It's easy to forget that many of those bits stayed relatively constant for centuries without much change. Not that I'm complaining, with regards to STEM, but I've been reading more on modern agriculture recently, and it seems rife with local optimizations that completely ignore the big picture and what was and wasn't sustainable for the millenniums up to now. Part of my inadequacies is because my memory is terrible and my classes exceedingly uninteresting. I can't memorize dates to save the life of me. Obscure acts and battles go in one ear and out the other. But I'm at least finding that there is plenty of resources outside of textbooks and primary documents that I can absorb and learn from, so I'm slowly trying to reconcile this. Edit: Also writing, but that's part of what I use hubski for :)