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Invention of Gunpowder
Describes the invention of gunpowder by Tang Dynasty Chinese alchemists, around 850 A.D.

Invention of the Mirror
When was the mirror invented? Humans have probably used still water as a mirror for millions of years, but a sheet of glass with metal backing is a much more recent invention.

Invention of the Seismoscope
Describes the invention of the first seismoscope for detecting earthquakes, which was invented by Zhang Heng in China in the second century A.D.

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