Москвичей предупредили о резком похолодании09:45
The letter, also seen by the Metropolitan Police, was ordered to be disclosed to Brent Council, Claydon's family and stadium owners the Football Association.
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To dig deeper into these stories, archaeologists are now entering the second phase of works, including further condition, cleaning and conservation checks.
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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.