March 12 is the 71st day of the year in the Gregorian calendar, which is commonly used worldwide. It is often associated with the arrival of spring in the Northern Hemisphere, as it falls just a few days before the official start of the season. On this day, various events and observances take place. For example, National Girl Scout Day is celebrated in the United States, honoring the founding of the Girl Scouts of the USA in 1912. Additionally, March 12 has seen significant historical events, such as the discovery of the first successful polio vaccine in 1953.