What did they contribute? What are they know for ? For anicant
China

Gunpowder, paper, printing, and the compass are sometimes called the Four Great Inventions of Ancient China. Kites were first used as a way for the army to signal warnings. Umbrellas were invented for protection from the sun as well as the rain. ... They invented the abacus in the 2nd century BC.

I hope this helped

answer; analytical,creative and practical;