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1: The Solar System 1: Structure of the Earth 1: Waves 1: The Expanding Universe 4: Motion 4: Forces 4: Work and Energy 5: Current 5: AC and Electromagnetism 7: Earthview 7: Look at Stars 7: Gases 7: Lives of the Stars 2: EM wave properties 2: Atmosphere effects 2: Communications 3: Electrical energy 3: Energy efficiency 3: Generation 6: The Nucleus 6: Uses of radioactivity 7: Astronomers! 8: Geometry
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