Portal:History of science/Selected anniversaries/September 12
- 1725 - Birth of Guillaume Le Gentil, French astronomer (d. 1792)
- 1897 - Birth of Irène Joliot-Curie, French physicist, recipient of the Nobel Prize in Chemistry (d. 1956)
- 1906 - The Newport Transporter Bridge is opened in Newport, South Wales by Viscount Tredegar
- 1923 - Death of Jules Violle, French physicist and inventor (b. 1841)
- 1927 - Death of Sarah Frances Whiting, American physicist and astronomer (b. 1847)
- 1933 - Leó Szilárd, waiting for a red light on Southampton Row in Bloomsbury, conceives the idea of the nuclear chain reaction
- 1958 - Jack Kilby demonstrates the first integrated circuit
- 1961 - Death of Carl Hermann, German physicist (b. 1898)