Themes in World History" introduces developments in technology and hu man thought that have changed the course of history. It begins by goin g over ancient civilizations in Mesopotamia, Egypt, and the Indus Vall ey. It discusses each of their contributions to history from medical p ractices and the calendar to cotton and iron working. This episode dis cusses irrigation as one of the major keys in the birth of civilizatio n. Important periods of history such as the Classical period, the Rena issance period, the Industrial Revolution, and the 20th century are re viewed. To prepare for the world history portion of GED test it's help ful to visit museums, rent historical movies, and read the newspaper a nd magazines."