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Hong Kong-based S.K.H Li Ping Secondary School currently took part in the largest scientific research event of Hong Kong- “The Technology & Innovation Competition for Hong Kong Teenagers. The work it presented in the event was “the active-alert screw, nut, and washer,” which won the top 1 Award in the category of Physics & Engineering of the competition and the Special Honor presented by the Yale Science and Engineering Association (YSEA). This work was co-designed by Wen-jing Chu, Ming-hsien Chien, and Mei Wu for solving screw loosening resulted from vibration or incomplete locking. Users can see a different color as an alert on the screw when it becomes unexpectedly loose, so they know it is time to repair the screw to prevent incidents from happening. This work is simple and very practical.