character: Jane Smith
topic: Overview of Hydropower
grade: 9
subject: Physics
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character: John Doe
topic: Introduction to Renewable Energy Sources
grade: 9
subject: Physics
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character: Emily Johnson
topic: The Science Behind Dams and Reservoirs
grade: 9
subject: Physics
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character: Mike Brown
topic: Basic Principles of Energy Conversion
grade: 9
subject: Physics
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