Thanks to reviewing textbooks every day, the list of subjects I wish I had the time/money/etc to study has started to solidify, consisting of (at the least): chemistry, economics, various computer programming fundamentals (i.e. logic gates, possibly discrete math?), and statistics. Yes, I'm fully aware that I can pick up textbooks at any point and study these on my own, but boy do I not learn well without a social aspect to my education. Also, I don't have the time.