Take a walk through time, 1852 to 1994, following the mathematical history and development of the Four-Color Theorem. Learners take on the role of cartographers to study an imaginary world of countries that need to be...

Amazing high-quality satellite imagery, photos, informational graphs, and detailed diagrams comprise this presentation on the movement of estuaries and the continental shelf. Data used as an example is from The Chesapeake Bay and because...