"The one exclusive sign of thorough knowledge is the power of teaching."
On this day: July 9
Wolfgang and Maria Anna Mozart
- 1763 – The Mozart family grand tour began, presenting child prodigies Maria Anna and Wolfgang (both pictured) in Western Europe.
- 1877 – The inaugural Wimbledon Championship, the world's oldest tennis tournament, began in London.
- 1896 – Politician William Jennings Bryan made his Cross of Gold speech advocating bimetallism, considered one of the greatest political speeches in American history.
- 1958 – An earthquake struck Lituya Bay, Alaska; the subsequent megatsunami, the largest in modern times, reached an elevation of 1,720 ft (524 m).
- 1962 – In a seminal moment for pop art, Andy Warhol's Campbell's Soup Cans exhibition opened at the Ferus Gallery in Los Angeles.
- Ann Radcliffe (b. 1764)
- Anna Morandi Manzolini (d. 1774)
- Courtney Love (b. 1964)
- Fernando de la Rúa (d. 2019)