accounting firms that ran phones on the side) and took naturally to gathering
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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Reports of African men being attracted to Russia by promises of jobs and ending up on Ukraine’s frontlines have become more frequent in recent months, creating tensions between Moscow and some of the countries involved.