>>/20285/
I think it has to be:
1. Philosophy, and I mean actual thinking and mapping it into reality not just larping, philosophy of mind should be the first one in current zeitgeist.
2. Pure math, which I know too little to propose, but those general branches like topology, group, set theories.
3. Physics, also the most abstract, including all the experimental models and their inherent contradictions. 
4. Chemistry, just for the loads of, but still bounded, stuff to know and memorize and combine.
5. Electronics, engineering, /n/ stuff, interests in how clockwork things works.
6. Ciclismo and other good for body and soul interests.
7. and further on, languages, table top games, cooking and some oddballs like dinosaurs, heraldry, basketweaving.