2月25日下午，国家主席习近平在北京钓鱼台国宾馆会见来华进行正式访问的德国总理默茨。
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Bolivian banknotes were seen scattered at the crash site
Медведев вышел в финал турнира в Дубае17:59
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.