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This website serves as an online textbook about the Earth's magnetosphere and was developed by a retired space physicist. The emphasis of the site is on the history, conceptual understanding, and basics relating to electrons, ions and their motion in space, plasmas and energy. The site also covers planetary magnetospheres, cosmic rays, space weather, selected spacecraft missions, an activity for creating a paper model of the magnetosphere, and a project for plotting interplanetary field lines. It includes informational text divided into 35 chapters, a glossary, timeline, questions and answers, a teacher's introduction to the Earth's magnetosphere, suggestions for teaching about magnetism using classroom demonstrations, and articles titled Birth of a Radiation Belt and Secrets of the Polar Aurora.