character: Galileo Galilei
topic: Density and Its Effect on Falling Bodies
grade: 12
subject: Physics
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character: Isaac Newton
topic: The Law of Universal Gravitation
grade: 12
subject: Physics
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character: Archimedes
topic: Buoyancy and Density
grade: 12
subject: Physics
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character: Henri Becquerel
topic: Density and Radiation
grade: 12
subject: Physics
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