- 1758 French astronomer Charles Messier mistakenly identifies the Crab Nebula so begins his Messier Catalogue
- 1910 United States' 1st female cop (on record), Alice Stebbins Wells, appointed (LAPD)
- 1933 Leó Szilárd, waiting for a red light on Southampton Row in Bloomsbury, conceives the idea of the nuclear chain reaction.
- 1940 4 teens, following their dog down a hole near Lascaux France discover 17,000-year-old drawings now known as Lascaux Cave Paintings
- 1958 US Supreme Court orders Little Rock Ark high school to integrate
- 1959 Luna 2 launched by USSR; 1st spacecraft to impact on Moon
1st submarine publicly tested in London on the Thames before James I
On September 12th, 1624