"Unification tries to describe 'as many as possible using as little as possible,." Includes: Aristotle - matter with four elements, Newton - celestial and earth mechanics, Maxwell - electricity and magnetism, Einstein - space and time, Glashow, Salam, and Weinberg - electromagnetism and weak into electroweak interaction. (Elena Symeonidou, U of Athens)

http://pdg.lbl.gov/fireworks/intro_eng.swf

I would add Darwin. Systems could be another such unification (generalization?)