character: Galileo Galilei
topic: Density and Buoyancy
grade: 9
subject: Physics
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character: Archimedes
topic: Principle of Buoyancy
grade: 9
subject: Physics
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character: Isaac Newton
topic: Fluid Mechanics
grade: 9
subject: Physics
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character: Albert Einstein
topic: Applications of Density in Relativity
grade: 9
subject: Physics
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