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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A number of the men’s players traveled to Washington on Tuesday and visited Trump in the White House before being guests at the State of the Union. Many of the women’s players, meanwhile, were on the way back to their professional or college clubs. They didn’t learn they had also had been invited until late Sunday, making it difficult to change travel plans already disrupted by bad weather on the East Coast.