1. Indiana's Official State Rock: January 31, 1965
On January 31, 1965, limestone was officially named the state rock of Indiana. The limestone industry has been a major part of Indiana's economy since the early 19th century and has left a lasting impact on the state's infrastructure and architecture.

2. Indiana's First Female Judge: January 31, 1925
On January 31, 1925, Florence Seibert was admitted to the Indiana Bar Association, becoming the state's first female judge. Seibert was a well-respected lawyer who advocated for women's rights and civil liberties. She went on to become a judge for the Indiana Circuit Court.

3. First Steamboat on the Ohio River: January 31, 1811
On January 31, 1811, the New Orleans, the first steamboat on the Ohio River, arrived in Louisville, Kentucky. This event marked the beginning of a new era in transportation, as steamboats became a popular mode of travel on the Ohio and Mississippi Rivers. Indiana played a large role in the steamboat industry, with ports in Evansville, Jeffersonville, Madison, and New Albany.

4. First Electric Streetcar in Indianapolis: January 31, 1890
On January 31, 1890, the first electric streetcar debuted in Indianapolis. The streetcar was a vast improvement over the old horse-drawn models, and increased the city's public transportation options. The streetcar lines in Indianapolis were eventually replaced by buses in the mid-20th century.

5. Indiana's First Medical School: January 31, 1903
On January 31, 1903, the Indiana University School of Medicine was established in Indianapolis. The school was founded with the mission of training physicians to serve the needs of the people of Indiana. Today, the IU School of Medicine is still one of the top medical schools in the country and is a leader in medical research and education.