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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儘管這份工作對身心都有高度要求，麥肯齊表示，沒有任何事能比得上他所經歷的那些令人難以置信的時刻，以及為環境研究作出貢獻的滿足感。