When to use fire?

Ancient humans discovered and used fire in the Paleolithic Age.

The use of fire, especially the invention of friction fire, had a great influence on the production of ancient humans.

The discovery and use of fire is a particularly important achievement of primitive people in Paleolithic age. For the use of fire, they experienced a long process from using nature to making fire artificially. That is fear-cognition |-use. Forest fires caused by volcanic eruptions and lightning strikes are terrible for primitive people. However, in the struggle against dangerous natural conditions, people gradually understand that it is warmer near the fire analysis, and the wild animals burned to death can satisfy their hunger. So they tried to find the fire, took the burning branches to the cave and used fire as a weapon to overcome the cold and prevent wild invasion. In the long-term labor process, they also found the phenomenon of friction fire. For example, striking flint or stone tools will produce sparks; When scraping wood, it will generate heat and even smoke and catch fire. After tens of thousands of years of exploration and attempt, they finally mastered the methods of artificial lighting such as beating, grinding and drilling in practice. These, they have made a transition from using nature to making artificial fires.

The discovery and utilization of fire is of great significance to the development of human beings and society. When people know and master fire, they enhance their ability to resist cold climate. Fire can barbecue food, can be used to hunt and defend wild animals, can illuminate and dry wet objects, and turn ice cubes into drinking water. Therefore, Engels pointed out: "Friction fire made people dominate a natural force for the first time, which eventually separated people from the animal kingdom."