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.
不過，香港感染及傳染病醫學會名譽司庫徐詩駿醫生對香港本地媒體指出，向政府領有飼養牌照的寵物犬，只要身體健康，並已接種所有指定疫苗——包括狂犬病（瘋狗症）疫苗——再加上每月下藥杜蟲，在餐廳傳播疾病的風險很低。
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Sebastian Crane