2. Movable type printing. Bi Sheng, an inventor in the Northern Song Dynasty, invented movable type printing and improved block printing. He summed up the rich practical experience of block printing in past dynasties. After repeated experiments, he made clay movable type in Song Renzong in the Qing Dynasty (A.D. 104 1- 1048) and made typesetting and printing, thus completing a major revolution in the history of printing.
3. Seismograph. The seismograph is a masterpiece created by Zhang Heng, a scientist of the Eastern Han Dynasty in China. During the Eastern Han Dynasty when Zhang Heng lived, earthquakes were frequent. Zhang Heng has a lot of personal experience about earthquakes. In order to master the national earthquake dynamics, after years of research, he finally invented the Hou Feng seismograph in the first year of Yangjia (AD 132), which was also the first seismograph in the world.
4, keel waterwheel. The keel waterwheel began in the Eastern Han Dynasty and was improved by the inventor Ma Jun during the Three Kingdoms period. Since then, it has been playing a great role in agriculture. The keel waterwheel is also called "rollover" and "pedaling", and the province is called "keel". Irrigation tools in the history of Han nationality are very popular in most areas of China. This kind of water lifting facility has a long history. Because it is shaped like a keel, it is named "keel waterwheel".
5, hemp boiling powder. The legend of Mafeisan is an anesthetic invented by Hua Tuo and used in surgery. "The Biography of Hua Tuo in the Later Han Dynasty" said: "If the disease accumulates in the body, those who cannot be reached by acupuncture and medicine will first make the hemp boil away with wine, so that they will be drunk and sleepless, and they will accumulate (block)."