character: Sir Isaac Newton
topic: Newton's First Law of Motion
grade: 4
subject: Science
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character: Galileo Galilei
topic: Concept of Inertia
grade: 4
subject: Science
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character: Aristotle
topic: Early Ideas of Motion
grade: 4
subject: Science
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character: Albert Einstein
topic: Relativity and Motion
grade: 4
subject: Science
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