That is, the third-level subdivision of history on the knowledge base has been  pushed all the way back to where I am beginning. Most of these finer divisions are stubs without much connected to them, but they are so far a convenient size to think of.

   In another sense, my study of prehistory is just beginning.  I have reached the point where I can begin making notes on cultural change, specifically the transition from largely nomadic hunters and gatherers to settled farming communities.

   For antiquity, I'm not quite there: I'm still working on making connections to what I call the agrarian revolution, or the development of civilization.

   For classical and medieval history, mostly I'm connecting the major subdivisions to parts of culture.

   This process of linking is nearly done for the centuries of modern history. For now, I am looking at the 20-year periods of the 20th century.

    I have also been making more links among the major nations; the dozen or twenty most populous, and the peoples I have assigned them to. This will eventually help when I go to fill in details of their history, because for each nation, I have been attempting to list the connected nations in the order of proximity or major cultural influence.