As "China Travel" trends across social media, international visitors are noticing the same thing — a striking sense of safety. This "Chinese sense of safety," reflected in everyday moments from walking alone at midnight to leaving belongings unattended, is quickly becoming a shared concept online. What makes it possible and why is it resonating globally? Watch this episode of PD Explainer to find out. (Produced by Fan Liuyi, Di Jingyuan, Ni Tao, Chu Chu, interns Zhi Yanyan, and Zhou Jiayu)