1. June 26, 1974 - the first UPC marked item ever scanned at a retail checkout was a 10-pack of Wrigley's Juicy Fruit chewing gum.
2. July 20, 1969 - Neil Armstrong became the first man to walk on the moon.
3. 1801 Thomas Jefferson was the first president to be inaugurated in Washington DC.
4. The first atomic bomb was detonated at Alamogordo, New Mexico on July 16, 1945.