Cavendish measured the density of the earth by finding the constants in Newton's law of universal gravitation, and then deduced the density of the earth. His guiding idea is extremely simple, use two large shot balls to make them close to two small balls. The mutual gravitational force between the balls is measured from the twist angle of the wire that hangs the balls. According to the law of universal gravitation, the constant G can be obtained

Once Cavendish attended a banquet, a scientist from Austria flattered Cavendish in person. He was very embarrassed at first, and then at a loss. , finally couldn't sit still and stood up, rushed out of the room and got on the carriage and went home. Cavendish was taciturn and would often sit by without saying a word to the visiting guests, thinking about scientific issues in his mind, which embarrassed and disappointed some literati. He devoted his life to scientific research and achieved fruitful results, but he only published two unimportant papers. (Actually, it was because he was withdrawn and shy to the point of being "pathological" that even he and his housekeeper needed to communicate by letter; even when attending the weekly gatherings held by Banks at that time, all participants were required to be present in person. He doesn't exist, and asking for his advice needs to be done as if there's no one around, so you might get a vague answer or an angry scream.

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