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March 23rd is notable for the founding of the World Meteorological Organization (WMO) in 1950, an agency of the United Nations dedicated to promoting international cooperation in meteorology, climatology, hydrology, and related fields.
Additionally, March 23rd marks the anniversary of the “OK” hand gesture being first used in print in 1839. This simple but versatile gesture has become one of the most widely recognized and used symbols around the world.
Learn more on Wikipedia