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# High Speed Rail39

The Physics Behind Tennis's Fastest Serves

A Chinese science outlet explains how players generate serves approaching 263 km/h — roughly the cruising speed of a high-speed train. The secret lies not in the arm but in a full-body kinetic chain from feet to racket.

🔬 Science2 min read#Tennis#Research

China Opens Four High-Speed Rail Lines in One Day

Four new high-speed rail lines opened across China on September 28, linking northern, northwestern, central and northeastern regions ahead of the National Day holiday. The additions tighten the country's 'eight vertical, eight horizontal' rail grid and push several cities into the high-speed era for the first time.

💻 Technology3 min read#High Speed Rail#Travel Guide

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