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.
接受BBC訪問時，關恆憶述得悉庇護申請獲批時的感受，「當時最主要的感覺還是就是如釋重負吧，就是沒有那麼焦慮了。」
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Цены на нефть взлетели до максимума за полгода17:55
And I started running tests. I wanted to compare the effect of atlas size, so I made lots of screenshots and started looking closely. I wanted to come up with a way to recommend a specific size. I wanted to make recommendations for all the other parameters. I showed all the commands I ran.