Have students watch the following YouTube clip of the Gall-Peters Projection Map (3:59 minutes). Facilitate a classroom discussion about the process of mapmaking and discovery starting with what students already know. Discuss standards, common practices, and conventions they are familiar with. How are maps traditionally oriented? How is scale usually determined? How do mapmakers, called cartographers, indicate data and other information for readers (such as a map key)? How have mapmakers dealt with the problem of projection—or transferring—a round shape to a flat surface? How do students know what they already know? Talk about what their knowledge is based on. Have they read about it before, or saw it in a movie or television show?