character: Zhang Heng
topic: Invention of the Seismograph
grade: 10
subject: History
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character: Gunpowder Inventors
topic: The Development and Transfer of Gunpowder Technology
grade: 10
subject: History
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character: Cai Lun
topic: The Invention of Paper and Its Influence on the West
grade: 10
subject: History
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character: Xuanzang
topic: Cultural and Technological Exchange Along the Silk Road
grade: 10
subject: History
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