Middle school students in Xingtai， north Chinas Hebei Province， display greeting cards in celebration of World Hello Day on November 19.
Everybody can participate in World Hello Day， which falls on November 21 every year， simply by greeting 10 or more others. The holiday， which originated as a response to the 1973 Arab-Israeli War， aims to demonstrate the importance of personal communication in preserving peace. It has been increasingly celebrated in China in recent years as an occasion to express good will between people.
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