秘鲁经济曾经历一段真正的黄金时期，国际媒体一度把它称为“拉美明星”“安第斯之虎”。一切似乎都在向好，但好景不长。2013年前后，增长开始明显放缓：2001—2013年GDP年均增长约6.1%，而2013—2019年却降至约3.1%，几乎腰斩。
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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.