Four great inventions of China

The Four Great Inventions of China is a viewpoint about the history of China's science and technology, which refers to the four great inventions that had great influence on the world in ancient China, and the important creations of the working people in ancient China, which refers to papermaking, compass, gunpowder and printing. This statement was first put forward by Yue Se, a British sinologist, and later inherited by many historians in China. It is generally believed that these four great inventions greatly promoted the development of politics, economy and culture in ancient China. These inventions spread to the west through various channels and had a great influence on the history of world civilization. Introduction to Four Great Inventions 1, Compass

Compass is a simple tool to judge the direction. Originally known as Sina. The main component is a magnetic needle that can rotate freely on the shaft. The north pole of the magnetic needle points to the geographical north pole, which can be used to identify the direction.

Step 2 make paper

Cai Lun's improved papermaking (also known as Cai Houzhi). In the first year of the Eastern Han Dynasty and the first year of Yuan Xing (A.D. 105), Cai Lun made plant fiber paper suitable for writing on the basis of summarizing the previous experience in making silk products, and improved the papermaking technology, making paper a widely used writing material. It is called "Cai Hou Paper". 3, gunpowder

Gunpowder was invented by an alchemist of Han nationality in Sui and Tang Dynasties in China. The study of gunpowder began with the ancient Taoist alchemy. The ancients refined Dan medicine in order to live forever. The purpose and motive of alchemy are advanced, but its experimental method still has some advantages, which eventually led to the invention of gunpowder.

4. Woodblock printing

It is reported that Bi Sheng invented clay movable type printing in the Northern Song Dynasty, which is regarded as the earliest movable type printing technology in the world.