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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针对“未来之城”雄安新区的建设，告诫“把每一寸土地都规划得清清楚楚后再开工建设，不要留历史遗憾”；
"[Our company] made that brick from the late 60s through about the middle part of the 80s, and I had sold millions of bricks from that plant."