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.
Prosecutors said in court that officers arrived at the park after a 911 call about a disorderly group, including people climbing on a roof.
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The leaked police log shows that, at 12:40, Peter 1 issued the order allowing the use of lethal fire.
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