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World Hello Day is a secular holiday observed annually on November 21, to express that conflicts should be resolved through communication rather than the use of force. Participants verbally greet ten people or more on that day as an expression of the importance of personal communication in preserving peace. The annual global event began to be celebrated in 1973 as a response to the Yom Kippur War.

World Hello Day was founded in 1973 by Brian McCormack, a Ph.D. graduate of Arizona State University, and Michael McCormack, a graduate of Harvard University, in response to the Yom Kippur War. World Hello Day has been observed by people in 180 countries.

World Hello Day was begun in response to the conflict between Egypt and Israel in the fall of 1973. People around the world use the occasion of World Hello Day as an opportunity to express their concern for world peace. Beginning with a simple greeting on World Hello Day, their activities send a message to leaders, encouraging them to use communication rather than force to settle conflicts. As a global event World Hello Day joins local participation in a global expression of peace.

Thirty-one winners of the Nobel Peace Prize are among the people who have noted World Hello Day's value as an instrument for preserving peace and as an occasion that makes it possible for anyone in the world to contribute to the process of creating peace.

November 21, 2013, marked the 40th annual World Hello Day.