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."
At least 11 killed after military plane carrying banknotes crashes in Bolivia
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Walmart to pay $100m over claims it misled drivers over pay
经国务院批准由中国国际商会组织设立的仲裁机构向国务院司法行政部门备案。
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