human beings in primitive society ate raw food like wild animals. Until a small group of intelligent human beings invented the technology of using fire (such as drilling wood for fire, Flint for fire, etc.), the dawn of civilization began to appear. Since then, human beings bid farewell to the era of raw food, and cooked food greatly improved the life span of human beings. The invention of stone tools has further improved human aggression and productivity: hunting, farming and utensils. The use of stone tools has brought mankind into the stone age, just like a baby on the ground finally standing up and walking.

Chinese culture has experienced two stone ages: Paleolithic (about 3 million years to about 10000 years ago), and the development stage of human material culture marked by the use of beaten stone tools (stone tools). In the Paleolithic age, the emergence of tools greatly improved human productivity.

Neolithic age is a historical stage from the prosperity to the decline of clan commune system in primitive society. It takes the emergence of farming and animal husbandry as an epoch-making symbol, indicating that it has leapt from the natural gathering, fishing and hunting economy to the natural production economy. The emergence of grinding stone tools, pottery and textile is also the basic feature of this era. In short, human beings have the slightest ability to transform nature and no longer rely only on the acquisition of nature. Active cultivation of resources began, such as farming and breeding.

when the development of social population and social civilization reaches a certain degree, human beings rely on the productivity of ancient stone tools, there will be insufficient resource production, and the survival pressure will increase greatly. The pressure urges human beings to find tools with higher productivity, and bronzes came into being.

the chronological range in the world ranges from about 4000 BC to early AD. All parts of the world have entered this era sooner or later. Bronzes were used in southern Iran and Mesopotamia from 4000 to 3000 BC, in Europe from 4000 to 3000 BC, and in India and Egypt from 3000 to 2000 BC. Bronze was used later in Africa other than Egypt and North Africa, about no later than 1000 BC to early AD. The copper smelting center did not appear in America until the 11th century.

China mastered the bronze smelting technology before 3000 BC. The emergence of

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bronze means that civilization has entered the bronze age, and the productivity is much higher than that of the stone age. Bronze was first used in war, and the frequent occurrence of war made the bronze technology more perfect. In the period of our country, the prosperous use of bronze even determined the fate of a country. (for example, the state of Chu achieved the goal of hegemony by seizing the Tonglu mountain of the Zhou royal family, and directly dominated the world due to the mature use of bronze weapons.)

in fact, iron ware appeared in the spring and Autumn period and the Warring States period, but it was limited to technology, and iron ware did not get large-scale application. After the Han Dynasty, the iron technology of the Han culture once took the lead in the culture of the whole world. It used iron to fight south and North and lay a promising territory. All ethnic groups in Asia trembled under the prestige of the Han nationality in the upper kingdom of the Chinese dynasty. At present, the oldest iron smelting ware found in China is two iron bars unearthed from mogousiwa cultural tomb in Lintan County, Gansu Province, dating from 3510 to 3010 years ago (1510 to 1310 BC). Before that, the earliest record of smelting iron was maintained by the jade handled iron sword of the state of Guo in 800 BC.

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the development of social productivity in the iron age has reached a certain bottleneck. In order to obtain more control over resources, mankind has started to look for new driving forces. James · in the whole country’s industrial development in urgent need of new power, he focused on the steam power invented by his predecessors. (the world’s first steam engine was the aerolipile invented by the ancient Greek mathematician hero of Alexandria in the 1st century, which is the prototype of the steam engine. Around 1679, French physicist Dennis baben created the working model of the first steam engine after observing the steam escaping from his pressure cooker. The sponsorship of

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entrepreneurs, especially John Roebuck, greatly increased Watt’s confidence. After many experiments, Watt finally invented the world’s first practical steam engine. The emergence of this machine directly brought the whole iron civilization into the steam age. Steam as power is more stable, lasting and powerful than the use of natural resources (such as water power, wind power) and manpower. With the utilization of steam and the development of productive forces, Britain took the lead in completing industrial * * and became the overlord of the whole earth – the Empire of never setting sun.

and electricity is the energy driven by electric energy. Invented in the 1870s, the invention and application of electric power set off the climax of the second industrial * *. The concept of electricity was first proposed by Thales, an ancient Greek philosopher in 500 or 600 BC. Fuckland Lin was the first madman to try to control the power of God with a kite.

in 1821, he stepped on the shoulders of his predecessors and invented the motor, which is the ancestor of all motors used in the world today. In 1831, Faraday discovered electromagnetic induction and created the world’s first generator capable of producing continuous current. Since then, controlling electricity has become the driving force of the second industrial * *., Nikolay Tesla and others, a large number of outstanding scientists, produced and invented items, which directly laid the foundation of modern civilization. (now we are still using electricity to watch mobile phones)

whoever controls the new power will control the world!

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are not just words. In early 1939, German chemist Hahn and physical chemist strasman published a paper on the phenomenon of nuclear fission of uranium atoms. From then on, Pandora’s box was opened. By 1945, the United States had dropped two nuclear bombs – fat man and little boy – that changed the fate of the world in Hiroshima and Nagasaki. The shallow application of nuclear energy in war has received such miraculous effects, which has shocked the whole world. Since then, nuclear energy has been intensively studied by countries all over the world in an attempt to fully control nuclear energy. Unfortunately, in addition to making nuclear bomb explosions and engaging in power generation, it is still unable to control nuclear accumulation