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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Less than 40 miles north of San Francisco, the city of Benicia has the quaint ambience of an American small town, where a white gazebo and sign for a community crab bake mark the approach to a vibrant downtown stretch of restaurants, cafes and antique shops.
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