character: Albert Einstein
topic: Applications of Density in Relativity
grade: 9
subject: Physics
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character: Isaac Newton
topic: Gravity and Its Relation to Density
grade: 9
subject: Physics
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character: Niels Bohr
topic: Quantum Theory and Density
grade: 9
subject: Physics
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character: Galileo Galilei
topic: The Role of Density in Early Physics
grade: 9
subject: Physics
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