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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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“The purpose of the whole investigation is to try to understand many things about Epstein,” he told reporters outside the convention center where the depositions were being held. “How did he accumulate so much wealth? How was he able to surround himself with some of the most powerful men in the world?”
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