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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12月24日，北京奥林匹克公园龙形水系，不少市民在湖面上滑冰，保安在岸边执勤。记者了解到，这一冰面预计在元旦前后开放为正规滑冰场，目前冰面厚度还不够，相关负责人建议市民、游客等几日再上冰游玩。新京报记者 王子诚 摄A08·北京SourcePh" style="display:none"
13年不懈奋斗、近1亿人稳定脱贫，中国为什么能？