April 25 is an important day in Oklahoma history, with several significant events having occurred on this date over the years. Here are five interesting facts about April 25 in Oklahoma history:

1. On April 25, 1890, the Oklahoma Territorial Legislature established Normal School Number One in Edmond, which later became University of Central Oklahoma.

2. In 1945, an F5 tornado struck Tipton, Oklahoma on April 25, killing 114 people and injuring over 400 others. It remains one of the deadliest tornadoes in Oklahoma history.

3. On April 25, 1963, the Oklahoma Legislature passed a resolution officially declaring the State Song to be "Oklahoma!," written by Oscar Hammerstein II and Richard Rodgers.

4. On April 25, 1975, the Oklahoma City Thunder NBA team (then the Seattle SuperSonics) won their first-ever playoff series, defeating the Detroit Pistons in the Western Conference Semifinals.

5. In 1995, the bombing of the Alfred P. Murrah Federal Building in Oklahoma City occurred on April 19, but the one-year anniversary memorial service was held on April 25, with President Bill Clinton attending and speaking.