1. On February 21, 1949, the Wisconsin State Assembly passed a bill that made it illegal to sell margarine colored to look like butter. This law was in effect until 1967, when the Wisconsin Supreme Court declared it unconstitutional.

2. The first in-flight movie was shown on February 21, 1925, on a flight from Chicago to Milwaukee. The film was a silent movie called The Lost World.

3. On February 21, 1885, the Milwaukee Road Railroad was incorporated in Wisconsin. The railroad was notable for its use of electrification and the development of the first practical electric locomotive.

4. On February 21, 1919, Wisconsin ratified the 18th Amendment to the US Constitution, which prohibited the sale, manufacture, and transportation of alcoholic beverages. The amendment was repealed in 1933.

5. Wisconsin native and inventor, Joseph J. Woodland, was born on February 21, 1921. Woodland is credited with inventing the barcode, which revolutionized the retail industry and made inventory management more efficient.