1. On January 18, 1851, the first "Great Train Wreck" in the United States occurred in Jefferson County, Indiana. An engineer and a brakeman were killed in the accident, and it led to significant improvements in railroad safety.

2. Indiana's state tree, the tulip tree, was officially adopted on January 18, 1931.

3. On January 18, 1904, the Indiana Historical Society was founded in Indianapolis. The organization has since become a significant resource for Indiana's history and heritage.

4. In 1972, the American Water Works Association Indiana Section held its first annual conference on January 18. The organization works to improve the quality and supply of water in Indiana.

5. On January 18, 1882, Hoosier architect Samuel Plato designed and patented the first modern revolving door. The invention was a significant improvement over existing door designs for commercial buildings, and it is still in use today.