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Asked by aaliyah from Usa | Dec. 08, 2015 08:25
About:History of China

Is there other invention made by the Han?

I know the most important is paper making but just saying,is there other inventions that was a success?

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Answered by Gilbert from United Kingdom | Dec. 09, 2015 02:23
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Aaliyah, Zhang Heng invented seismograph to detect earthquakes and armillary sphere to study the universe. I think these two devices are two great inventions.
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