I like to push the discussion in a new(?) direction and want to ask for religions, the power of the gods (not in a black and white way) to explain some naturstuff or to find your power as a worrior (like the jettis from india, who forcing their life in one way to be the strongest).
Would be relgions in the game. So you need a priest in the midgame to cheer the town and maybe to do research and find some new methodes.
The sciencesystem could be also a part in the caste system (like in india, and no, im not from there :P ). A priest-caste, a warriors-caste, a builder-caste, a farmer-caste, etc. and mainperson in this caste will do research or could mandate the research? And a better skill in the sector would let them be able to do more and better science or build more solid houses, etc.
Hope my thoughts a all clear enoth to understand :)