First, the invention and improvement of papermaking. In the Western Han Dynasty, silk floss and hemp were used to make paper, which was the ancestor of paper. In the Eastern Han Dynasty, Cai Lun improved papermaking and brought about a revolution in writing materials. Cai Hou's paper is easy to carry, widely used and cheap, which has promoted the cultural development of China, Arabia, Europe and even the whole world. Therefore, papermaking in Han Dynasty became one of four great inventions of ancient china.
2. Astronomy and medicine in Han Dynasty made rapid progress. Zhang Heng, a great scientist and astronomer in the Eastern Han Dynasty, invented the first seismograph capable of monitoring earthquakes, and also invented a large number of black technologies, such as the water leakage-to-armillary sphere, the Swiss wheel pod and Thoreau wood carving. Awesome! In medicine, Zhang Zhongjing, a medical sage in the Eastern Han Dynasty, wrote Treatise on Febrile Diseases, and Hua Tuo, a physician, invented Mafeisan, becoming the first person to use anesthesia in China.
Third, the leap-forward development in the field of mathematics laid the foundation of ancient mathematics in China. Zhou Kuai Shu Jing in the Western Han Dynasty and Jiu Zhang Arithmetic in the early years of the Eastern Han Dynasty are masterpieces of mathematics. Especially "Nine Chapters Arithmetic" is a summary of the development of mathematics in the period of the Warring States, Qin and Han Dynasties. It takes nine chapters of arithmetic as evidence, and lists four operations of fractions, three methods of the present (called the three-rate method in the west), square roots and square roots (including the numerical solution of quadratic equations) and surplus (surplus). Who dares to say that China's mathematics comes from the west?
Fourth, in the invention of technology, the Han Dynasty made a qualitative leap. China's ancient ceramic skills appeared as early as Xia, Shang and Zhou Dynasties, but it was not until the Han Dynasty that Chinese porcelain really caught fire. A large number of black technologies were also invented in the Han Dynasty, such as distillation, hydraulic mill, prototype of modern horse yoke and abdominal belt, lacquerware, reciprocating piston bellows for metallurgy, unicycle, waterwheel, suspension bridge and so on. In addition, the smelting technology of the Han dynasty also advanced by leaps and bounds. Han dynasty magic mirror? Known as the bronze transparent mirror. Distilled liquor also appeared in the Han dynasty, and the level of liquor-making reached the point of perfection. During the Eastern Han Dynasty, new irrigation tools such as drainage appeared, and agricultural technology was greatly improved.
Science and technology are the primary productive forces. The Han Dynasty was an era of rapid development of science and technology in ancient China, and a large number of black technologies emerged, which made us marvel at the wisdom of the ancients. It is their genius and creativity that have promoted social progress and made the Chinese civilization brilliant. Finally, let's appeal for them!