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We're all familiar with the high-pitched squeak of basketball shoes on the court during games, or tires squealing on pavement. Scientists conducted several experiments and discovered that the geometry of the sneakers' tread patterns determines the squeak's frequency, enabling the team to make rubber blocks set to specific frequencies and slide them across glass surfaces to play Star Wars' "Imperial March."
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The mystery of why soft shoes squeak on hard floors may be solved, according to new research
三位曾對總統不利裁決的大法官坐在前排，表情毫無變化地觀看。