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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Women report being slightly more sexually satisfied than men, revealing a surprising gender trend. Relationship satisfaction doesn't fully explain why women are more sexually satisfied than men. Women's tendency to report higher satisfaction might be influenced by socialization and disclosure norms.
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"It depends on the scale at which it happens," says Jackson of Capital Economics.