1. In 1882, the Olds Motor Vehicle Company was founded in Lansing, Michigan by Ransom E. Olds. It was one of the first companies to mass-produce automobiles and was the predecessor to General Motors.

2. On May 20, 1929, the Ford Motor Company introduced the first low-priced car with a V-8 engine, the Ford Model A. It quickly became one of the most popular cars of the time.

3. In 1949, a fire destroyed the Olds Motor Works factory in Lansing, Michigan. The factory was rebuilt and continued production until 2004, when it closed permanently.

4. On May 20, 1964, the Detroit Tigers became the first American League team to use a designated hitter in a regular season game. The designated hitter rule allowed a player to hit for the pitcher without having to play a defensive position.

5. In 2006, Michigan became the first state to enact a smoking ban in all workplaces and public places, including bars and restaurants. The ban went into effect on May 20 of that year and has since been adopted by many other states across the country.