1. On May 7, 1906, the Oklahoma Territory and the Indian Territory merged to become the state of Oklahoma. The merging of the two territories ushered in a new era for the state and marked a significant moment in its history.

2. On May 7, 1967, Oklahoman astronaut Thomas Stafford piloted the Gemini 6 spacecraft in the first rendezvous of two manned spacecraft in history. Stafford and his crewmate, Wally Schirra, successfully docked their spacecraft with the Gemini 7 spacecraft, which was orbiting the Earth.

3. In May 1999, Oklahoma was struck by a devastating tornado outbreak that resulted in more than 50 fatalities and hundreds of injuries. On May 7, a tornado outbreak occurred in the state that produced several large and destructive tornadoes.

4. On May 7, 1937, a gas explosion occurred at the Three Mile Island nuclear power plant in Pennsylvania. The disaster resulted in widespread fear about the safety of nuclear power and led to significant changes in the regulation of the industry.

5. May 7 is also celebrated in Oklahoma as Teacher Appreciation Day, a time to recognize the important contributions of teachers to the education and development of the state's youth. The holiday was established in 1984 by the National Parent Teacher Association and is observed annually on the first Tuesday in May.