Northern Ireland's largest provider of natural gas, SSE Airtricity, is to cut its prices by 8.10% from 1 April for its 215,000 domestic and small business customers.
The move has further exacerbated the already crippling oil and fuel shortages Cuba has been suffering for years.
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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.