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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.
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据新华社12月15日援引澳大利亚广播公司报道，澳大利亚联合反恐小组调查人员表示，悉尼邦迪滩枪击事件两名嫌疑人曾宣誓效忠“伊斯兰国”恐怖组织。
This story was originally featured on Fortune.com
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