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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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（十）号召粉丝聚集。鼓励网民打卡未开发区域、交通要道等存在安全隐患的场所，诱导粉丝前往与社会热点事件相关的区域地点，干扰公共秩序，影响他人正常生活。
A separate claim that his co-host John Torode had used a severely offensive racist term was also substantiated. Torode has said he has "no recollection" of the incident.