China's four great ancient inventions made tremendous contributions to the world's economy and the culture of mankind. They were also important symbols of China's role as a great world civilization.

Paper is one of the four great inventions of ancient China. When Ai was 13, she first learned about Cai Lun, the inventor of the paper-making process during the Eastern Han (25-220) dynasty.

BEIJING, June 9. /PRNewswire/ From the compass, papermaking, printing and gunpowder - the four great inventions of ancient China - to manned submersible Jiaolong, the Hong Kong-Zhuhai-Macao Bridge ...