character: Chang Cheng
topic: Gunpowder Inventors
grade: 10
subject: History
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character: Alchemists of the Song Dynasty
topic: Development of Gunpowder Technology
grade: 10
subject: History
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character: European Military Engineers
topic: Transfer of Gunpowder Technology
grade: 10
subject: History
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character: Middle Eastern Scholars
topic: Influence on Gunpowder Development
grade: 10
subject: History
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