August 11: Independence Day in Chad (1960)
Hedy Lamarr
- 1492 – The first papal conclave held in the Sistine Chapel elected Roderic Borja as Pope Alexander VI to succeed Pope Innocent VIII.
- 1828 – William Corder was hanged at Bury St Edmunds, England, for the murder of Maria Marten at the Red Barn.
- 1942 – Actress Hedy Lamarr (pictured) and composer George Antheil received a patent for their "Secret Communications System", an early technique of frequency-hopping spread spectrum that later became the basis for many forms of today's wireless communication systems.
- 1965 – Violent race riots began in Watts, Los Angeles, California, lasting for six days and leaving 34 people dead and 1,032 others injured.
- 2012 – At least 306 people were killed and 3,000 others injured in a pair of earthquakes near Tabriz, Iran.
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