The United Kingdom conducted its first successful nuclear test in 1952.
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- Cooper's Ferry is located at the bottom of a canyon near a bend in the lower Salmon River, at a site the Niimíipuu (Nez Perce) called Nipéhe, an ancient village.
- Five Vietnamese-American journalists were killed between 1981 and 1990, in violence FBI agents suspected was linked to the National United Front for the Liberation of Vietnam.
- The Levantine state of Ebla began using arithmetic, algebra, and geometry around the same early period as ancient Egypt and Mesopotamia.
- In England, a woman sentenced to death could receive a stay of execution until her baby was born if she was pregnant, a practice called 'pleading the belly'.
- One of the declassified documents outlines the chemicals and techniques necessary for developing certain types of secret writing ink and a method for opening sealed letters without detection.
- The number of major U.S. aerospace and defense prime contractors declined from 51 in the 1990s to five.