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."
儘管享受到了免於恐懼的自由，但日子過得並不容易，最拮据的時候，是蝸居在一處地下房內，靠著超市裡的冷凍食物度日。
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