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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What is today’s Moon phase?As of Friday, Feb. 27, the Moon phase is Waxing Gibbous. According to NASA's Daily Moon Guide, 80% of the Moon will be lit up tonight.。旺商聊官方下载对此有专业解读
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