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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More on this storyOasis fan suffered multiple injuries in fatal fall
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直到2015年前后，我才见到阿爸的生父，那时他已经长时间卧床不起了，瘦得只剩骨架，脸色发灰，眼睛却还睁着。阿爸站在床边，还是和之前一样，叫了一句“客边”。后来，“阿英”和“客边”都相继去世了。