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Earn +20 ptsQ: What did Zhang Heng invent?
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Who is Zhang Heng?
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.
How many brothers or sisters does Zhang Ziyi have?
She just has one elder brother
When did Benjamin Banneker invent the clock?
1919
What did gupta mathematicians invent?
0 and infinity.
When did john venn invent venn diagrams?
july1880
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