Occasionally, volcanic eruptions and lightning strikes can cause forest fires. When primitive humans first saw the raging fire, they were as far away as animals. However, human beings felt the warmth brought by fire, and also found cooked animals in the fire area and smelled cooked meat.

Humans attracted by the smell of meat ate cooked food for the first time. Since then, whenever there is a fire, people will look for cooked animals to eat. Cooked food has become a delicacy in human diet.

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