The first U.S. patent was granted to Samuel Hopkins for a process of making potash on July 31, 1790.
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- A 25-foot-wide, nearly 8-foot-deep pit carved into Göbekli Tepe's bedrock may have served as a cistern, while a carved channel found about 150 yards away was identified as early plumbing for collecting rainwater.
- The Tokyo University Historiographical Institute's 'Kaō Kagami' series, published since 1964, arranges images of historical figures' kaō (personal signature marks) in order of date of death and currently comprises 8 volumes covering people from the Heian period to the Nanboku-cho period.
- On March 31, 2004, four American Blackwater contractors were killed by a mob in Fallujah while escorting a convoy of food trucks, and at least two of their burned bodies were strung from a bridge spanning the Euphrates.
- Christopher Columbus credited Juan Cabrero, along with Diego de Deza, as being responsible for the Catholic Monarchs' acceptance of his Indies Enterprise proposal in 1492.
- The northern point of the triangle formed by Göbekli Tepe's enclosures is the largest of the three and the only one whose two stone monoliths bear anthropomorphic carvings.
- Pakistan conducted its first successful nuclear test in 1998.