1948 – Taman Shud Case: The body of an unidentified man is found in Adelaide, Australia, involving an undetectable poison and a secret code in a very rare book; the case remains unsolved and is "one of Australia's most profound mysteries."
1959 – Cold War: Opening date for signature of the Antarctic Treaty, which sets aside Antarctica as a scientific preserve and bans military activity on the continent.
1984 – NASA conducts the Controlled Impact Demonstration, wherein an airliner is deliberately crashed in order to test technologies and gather data to help improve survivability of crashes.