Brush originated from the story of Meng Tian's pen-making. In 223 BC, Meng Tian, the general of the State of Qin, went out to war. He regularly wrote battle reports and presented them to the king of Qin. At that time, people wrote with bamboo sticks, which was very inconvenient. They dipped in ink several times without writing. One day, while hunting, Meng Tian was inspired when he saw a rabbit's tail dragging blood on the ground. He immediately cut off some rabbit tail hair, put it on a bamboo tube and tried to write with it. But rabbit hair is shiny and does not absorb ink. Meng Tian tried several times again, but the effect was still not good, so he threw the "rabbit brush" into the stone pit in front of the door. One day, he happened to see the brush he had thrown away. After picking it up, he found that the wet rabbit hair became whiter. He dipped the rabbit brush into the ink tray, and the rabbit tail became "obedient" and wrote fluently. It turns out that the water in the sinkhole contains calcium. After soaking in alkaline water, the grease of rabbit hair is removed and becomes soft. Legend has it that this is the origin of the brush. Correct answer: Meng Tian, thank you for your adoption! !

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