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Екатерина Ештокина
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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
尖东曾经象征香港夜经济的野心：高消费、强仪式、重面子、重场面。上世纪八九十年代，随着香港经济高速增长和消费模式的转变，日式夜总会成为夜经济最重要的形态之一。尖东一带大规模夜总会聚集，装潢奢华、等级分明、消费高昂，名流、富豪、商界人物频繁出入。夜总会在很长时间里承担着一种特殊的城市功能：它是商业社会的“非正式中枢”。