1. In 1903, the first automobile was registered in Wisconsin. It was owned by Milwaukee resident George F Peck and had license plate number "1". This marked a major shift in transportation and mobility for the state.

2. On February 15, 1912, the first Wisconsin-made airplane took to the skies. Designed and built by Racine-based airplane pioneer Ivar Hedenstrom, the biplane successfully completed a test flight near Lake Michigan.

3. The Wisconsin Badgers men's basketball team made history on February 15, 2015, by securing their 16th consecutive win against the Illinois Fighting Illini. This set a new record for the longest winning streak in Wisconsin basketball history.

4. The Wisconsin state legislature passed Act 10 on February 15, 2011. This controversial legislation significantly curtailed the collective bargaining rights of public employees in the state, sparking widespread protests and political backlash.

5. On February 15, 1965, Nat King Cole performed at the Performing Arts Center in Milwaukee. This was one of the jazz legend's final concerts before his untimely death later that year, and is still remembered as a historic moment in Wisconsin music history.