The movable type printing, the compass (指南针) , gun powder and the paper making are called four great inventions of China.
活字印刷术、指南针、火药和造纸术被称为中国四大发明。
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Sony used racoon hair brushes to daub magnetic powder over the paper to produce what it cally "SONI TAPE", starting its history as an audio-video products maker.
Stone's paper describes his discovery by testing on himself and 50 members of his parish that ground willow bark powder relieves fevers and rheumatic pain.