Besides the text, what additional materials are needed for this curriculum? Where can I purchase them? Not sure if we need to be enrolled in K12 to get the materials. Hope not. It really looks like something we would like. Thanks much.

We just finished Story of The World - loved it! If I purchase History of The World, will we be going over the same information we learned in Story of The World, just on a deeper level (more critical thinking?) Please explain how a lesson would go if we purchase this curriculum. Thank you! Thank you!!