character: Marie Curie
topic: Discoveries in Density and Displacement
grade: 3
subject: Science
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character: Archimedes
topic: Principle of Displacement
grade: 3
subject: Science
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character: Albert Einstein
topic: Mass and Energy Density
grade: 3
subject: Science
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character: Isaac Newton
topic: Understanding Density in Physics
grade: 3
subject: Science
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