Collapse -- Why D Civilizations Fall - Mesopotamia? Explore the fall of civilizations through four examples: the ancient Maya, Mesopotamia, the Anasazi, and the medieval African empires of Mali and Songhai. Learn about important concepts in archeology such as interpreting evidence and dating artifacts. In a web-based activity, search for clues to what happened at the Maya center of Copan. http: //learner.org/exhibits/collapse/mesopotam...
Galileo and Einstein: Babylon History of the counting system. http: //galileo.phys.virginia.edu/classes/109N/lect...