1. The Birth of Eli Lilly: On December 7, 1838, Colonel Eli Lilly was born in Baltimore, Maryland. He later moved to Indiana and founded the pharmaceutical company that still bears his name.

2. Indiana's Move to Daylight Saving Time: In 1918, Indiana became the first state to adopt Daylight Saving Time. However, the state's implementation of the time change was inconsistent, with some areas of the state still opting out of the change until as late as 2006.

3. The Attack on Pearl Harbor: December 7, 1941, is famously known as the date of the Japanese attack on Pearl Harbor, which led to the United States' entry into World War II. Indiana lost over 3,000 soldiers during the war, and many Hoosiers played important roles on the home front, including producing war materials and serving as nurses and administrative support.

4. The Incarceration of Japanese Americans: After the attack on Pearl Harbor, President Franklin D. Roosevelt signed Executive Order 9066, which authorized the forced relocation and incarceration of approximately 120,000 Japanese Americans living on the West Coast. While Indiana was not directly involved in the internment camps, many Japanese Americans were brought to and from the camps via the rail system that ran through the state.

5. Indiana's Elevator Disaster: On December 7, 1991, a grain elevator in Haysville, Indiana, exploded, killing five workers and injuring several others. The explosion, which was caused by a buildup of combustible dust, led to increased safety regulations and awareness in the grain industry.