A lesson-based learning supplement that presents connections from pre-algebra to algebra, including a review of intervals and inequalities and an introduction to constants, variables and equations.

"As the last great Aztec ruler, Montezuma II inherited a sprawling yet fragile empire. This program studies his governance, its abrupt end at the hands of the conquistadors, and its historical meanings. Paralleling a major exhibition at the British Museum, the film features artifacts, architecture, and images that speak to Montezuma's humanity, his self-proclaimed divinity, and the cultural context in which he ruled. These include depictions from...

Carl Sagan discusses the cosmic relationship between man and the universe.