May 27 » The F4-strength St. Louis–East St. Louis tornado hits in St. Louis, Missouri, and East St. Louis, Illinois, killing at least 255 people and causing over $10-million in damage.
August 27 » Anglo-Zanzibar War: The shortest war in world history (09:02 to 09:40), between the United Kingdom and Zanzibar.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
Day of death July 12, 1961
The temperature on July 12, 1961 was between 12.7 °C and 25.1 °C and averaged 18.0 °C. There was 10.9 mm of rain during 2.1 hours. There was 3.8 hours of sunshine (23%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
January 25 » In Washington, D.C., President John F. Kennedy delivers the first live presidential television news conference.
April 25 » Robert Noyce is granted a patent for an integrated circuit.
May 1 » The Prime Minister of Cuba, Fidel Castro, proclaims Cuba a socialist nation and abolishes elections.
August 10 » Vietnam War: The U.S. Army begins Operation Ranch Hand, spraying an estimated 20million US gallons (76,000m) of defoliants and herbicides over rural areas of South Vietnam in an attempt to deprive the Viet Cong of food and vegetation cover.
October 20 » The Soviet Union performs the first armed test of a submarine-launched ballistic missile, launching an R-13 from a Golf-class submarine.
October 30 » The Soviet Union detonates the Tsar Bomba, the most powerful explosive device ever detonated.
When copying data from this family tree, please include a reference to the origin: F. van Dijk, "Family tree Van Dijk", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_van_dijk/R33566.php : accessed January 28, 2026), "Hendrik Heidema (1896-1961)".
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