character: Isaac Newton
topic: Gravity
grade: 3
subject: History
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character: Galileo Galilei
topic: Early Concepts of Gravity
grade: 3
subject: History
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character: Albert Einstein
topic: Theory of Relativity and Gravity
grade: 3
subject: History
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character: Aristotle
topic: Ancient Ideas about Falling Objects
grade: 3
subject: History
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