The iron-absorbing property of magnets was discovered long ago, and the nine volumes of Lu's Spring and Autumn Annals are proficient in: "Kindly absorb iron, or absorb it." It means that the ancients called "magnetism" "kindness". The ancients regarded magnets attracting iron as the attraction of loving mothers to their children. And think: "Stone is the mother of iron, but there are two kinds of stones: kind and unkind. Kindness can attract his children, but not kindness. "

Compass, called Sina in ancient times, is mainly composed of magnetic needles installed on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The north pole of the magnetic needle points to the north pole, so this property can be used to identify the direction.

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Lu Chunqiu is an important work at the end of the Warring States Period. It was completed around 239 BC, just before Qin unified the six countries. His book "basically takes Taoism as the Sect, takes the strengths of each family and abandons its shortcomings, so it can become a family statement."

Is it one of the representative works of Taoism in Qin and Han Dynasties? . Lv Buwei was a famous figure in Qin at the end of the Warring States Period. Lu has made great contributions to helping foreigners who have been exiled to Zhao set up their own offices. After the foreigner succeeded to the throne of Qin Zhuang, he was appointed as the Prime Minister of Qin State.

Lu's Spring and Autumn Annals is the first organized and planned work in the history of China. It is based on Taoist thought, adheres to the code of conduct of inaction, uses Confucian ethics to locate the value scale, absorbs the Mohist view of justice, the speculative logic of famous scholars and the legalist technique of governing the country, and forms a complete theory of state governance with the change of military tactics and the pursuit of farmers' geographical location.

Lv Buwei was a legendary businessman at the end of the Warring States Period. He went from business to politics, helped to establish a monarch and entered the political top. He was ambitious and edited "Lu's Spring and Autumn Annals", leaving an allusion that "in a word, money is hard to buy". Later generations generally classified Lu Chunqiu as a saint. In the history of management thought, this book has special value.

This is the first collection of works organized and planned in the history of China. From an academic point of view, it has a strong naturalistic color; From the perspective of management, it is full of utilitarianism. After the revision of the pre-Qin philosophers, Lu's Spring and Autumn Annals has formed its own characteristics and made its own achievements in the management thought of wholeness, wholeness and profundity.

From the theoretical framework of yin-yang and five elements to the concrete demonstration of empiricism; From the "inner saint" who keeps healthy and respects himself to the "outer king" who rules the country and calms the world; From adjusting the relationship between individuals and state, society and political power to the mutual matching of physiology, physics, rationality and psychology under the control of the natural way, a complete system has been formed.

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