1. Birth of Elmer McCollum: On June 7, 1879, Elmer McCollum was born in Fort Dodge, Iowa. He was a biochemist who is known for his discovery of vitamins A and D.

2. John Wayne’s roots: In 1907, John Wayne's parents, Clyde and Mary Morrison, were married in Winterset, Iowa. This is where the famous actor was conceived.

3. Cedar Rapids tornado: On June 7, 1933, a tornado hit Cedar Rapids, Iowa, causing widespread damage and killing 10 people. It was the deadliest tornado in the state that year.

4. First African-American woman mayor: On June 7, 1976, Maynard Jackson became Atlanta’s first African-American mayor. She was born in Dallas, Texas but became the first African-American woman Mayor.

5. Iowa State University founded: On June 7, 1858, Iowa State University was founded as Iowa Agricultural College and Model Farm. It is located in Ames, Iowa, and is a public land-grant and space-grant research university.