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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.
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On this day, 30 years ago, the original Pokémon games, Pokémon Red and Pokémon Green, were first released in Japan.
The revised plan also comes as NASA has been struggling to launch the delayed Artemis II mission on a flight to send four astronauts on a trip around the moon.
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