Middle prehistory is somewhat more interesting to me than early prehistory. Developments of this period include the spread of behaviorally modern humans over the earth. Developments of customs, art, and technology can be traced into this period. I don't quite have the connections to the 19th century and major peoples of the world quite where I want, but stone age cultural developments, hunting and gathering societies, and the earliest developments leading to agriculture can be examined. I can trace institutions to this period, and elements of culture including especially material culture. Anthropology and the fundamentals of the human body will be important, and I still need to link more of the sciences.