1. On April 21, 1922, the first radio station in Indiana, WBAA, began broadcasting from Purdue University in West Lafayette. It was one of the first radio stations in the country and played an important role in the development of radio technology and broadcasting.

2. April 21, 1865, was the day that President Abraham Lincoln's funeral train passed through Indiana on its way from Washington D.C. to Springfield, Illinois. Thousands of people lined the tracks to pay their respects to the fallen president.

3. On April 21, 1967, the Indiana Pacers won their first ABA championship by defeating the Los Angeles Stars. The Pacers would go on to win three more championships in the ABA before joining the NBA in 1976.

4. April 21, 2018, was a historic day for sports in Indiana as the Indiana Pacers and the Indiana Fever both played home playoff games on the same day. It was the first time in state history that two professional basketball teams had playoff games on the same day.

5. On April 21, 1836, the town of Michigan City was incorporated in northwestern Indiana. The town was an important hub for shipping and commerce on Lake Michigan and played a key role in the development of the region. Today, it is known for its beautiful lakefront and historic lighthouse.