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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對於中國解放軍而言，現在的局面也是史無前例的——在習近平上台前，根據公開資料統計，中共歷史上被處理的上將僅有一位黃永勝，他在1971年因林彪叛逃事件牽連而被處理。鄧小平、江澤民、胡錦濤時代都無上將被處理。習近平上台後，已有25名上將被開除黨籍、軍籍，其中除了徐才厚、郭伯雄等八人在習上台之前就已是上將，其餘都是他任內提拔，又在他任內被查。
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