character: Nicolaus Copernicus
topic: Heliocentric Theory
grade: 1
subject: Science
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character: Galileo Galilei
topic: Telescope and Astronomy
grade: 1
subject: Science
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character: Isaac Newton
topic: Gravity and Planetary Motion
grade: 1
subject: Science
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character: Ptolemy
topic: Geocentric Model
grade: 1
subject: Science
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