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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Donald Trump says he has not made a final decision on whether to launch strikes on Iran but is “not happy” with the situation and military force – including regime change – remains an option.
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The alert was for a story on the fallout from the ceremony, during which a member of the audience with Tourette's syndrome used the slur in an involuntary tic when actors Michael B. Jordan and Delroy Lindo took to the stage.