character: Isaac Newton
topic: Universal Gravitation
grade: 12
subject: Physics
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character: Galileo Galilei
topic: Early Concepts of Gravity
grade: 12
subject: Physics
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character: Albert Einstein
topic: General Relativity and Gravity
grade: 12
subject: Physics
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character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 12
subject: Physics
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