character: Galileo Galilei
topic: Astronomy and Physics
grade: 4
subject: Grammar
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character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 4
subject: Grammar
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character: Isaac Newton
topic: Gravity and Motion
grade: 4
subject: Grammar
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character: Copernicus
topic: Heliocentric Theory
grade: 4
subject: Grammar
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