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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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阿豪舉例說，不會讓毛孩觸碰餐廳的餐具：「有些人沒有養狗，例如只要覺得你碰過餐具，就算怎樣去洗都還是會有影響。」
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