1. The University of Dayton was founded on February 15, 1850. Originally known as St. Mary's School for Boys, it was established by the Society of Mary (Marianists) and is now a private Catholic research university with over 8,000 students.

2. The Ohio state flag was adopted on February 15, 1902. It features a blue triangle representing Ohio's hills and valleys, with 13 stars symbolizing the original colonies, a white circle for the "O" in Ohio, and stripes representing waterways and roads.

3. The Lima Locomotive Works, a major manufacturer of steam locomotives, was incorporated in Lima, Ohio on February 15, 1878. It became one of the largest employers in the city and helped fuel the growth of railroads in the 19th and early 20th centuries.

4. The "Great Dayton Flood" began on February 15, 1913, after days of heavy rain caused the Great Miami River to overflow. The floodwaters devastated the city of Dayton and surrounding communities, causing over 400 deaths and $100 million in property damage.

5. On February 15, 1804, the Ohio General Assembly passed an act to establish the town of Chillicothe as the state capital. It remained the capital until 1810 when it was moved to Zanesville, and then to Columbus in 1816 where it has remained ever since.