While not a cover of The Yardbirds' 1965 single of the same name, it aims for similar territory.
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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蜡梅和梅花的“成名”也分早晚。蜡梅在宋代才被普遍栽培为一种观赏植物，而梅花受人关注的时间更久远。1975年，我国考古人员在安阳殷墟商代铜鼎中发现了梅核，这说明早在3000多年前，梅已用作食品。汉初，梅花就已经成为一种观赏性植物。《西京杂记》载：“汉初修上林苑，远方各献名果异树，有朱梅、胭脂梅”。
$50 UGreen (12,000 mAh)
可“江湖”的惯性，远比一次功能更新更持久。某二手交易平台上，虚拟商品依旧活跃；新产品推出的“楼层级定位”“更强社交功能”，又在为这个数字小世界增添新的复杂度。这不禁令人思考：当功能性产品在技术的加持下不断强化“社交”属性，谁来为孩子们的“纯粹成长”留一方空间？