Professor Yamashita was very engaging. His presentation on the origins of the Japanese was fascinating. I also thought that his explanation of the loss of tax revenue during the Heian period was wonderful. In the seventh grade history textbook, there is one sentence that merely states: "These estate owners, called daimyo, paid no taxes to the government. There is no explanation as to why they did not pay taxes or about the long ranging consequences of this tax exemption. I think that it is important to teach students about the "causes" if we want them to ultimately understand cause and effect.