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[China] The Four Great Inventions of Ancient China

The Four Great Inventions (四大发明) are inventions from ancient China that are celebrated in Chinese culture for their historical significance and as symbols of ancient China's advanced science and technology. They are the compass (指南针), gunpowder (火药), papermaking (造纸), and printing (印刷). https://en.m.wikipedia.org/wiki/Four_Great_Inventions

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black giant hole for people who are into science stuff

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Affects the time due to its so strong gravitation force and stays for the longest possible time. Could depict the most old pen pals on the app.

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