Chinese inventor Zhang Heng is credited with several inventions. The world's first seismometer is one of his inventions. Zhang Heng also invented the water-powered armillary sphere.
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Zhang Heng was a famous astronomer and mathematician. He was also an inventor. He had some great invention that helped human. One of his most famous works is the thing that can detect earthquakes.
She just has one elder brother
1919
0 and infinity.
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