April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
May 26 » Dracula, a Gothic horror novel by Irish author Bram Stoker, is published.
May 26 » The original manuscript of William Bradford's history, "Of Plymouth Plantation" is returned to the Governor of Massachusetts by the Bishop of London after being taken during the American Revolutionary War.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
December 30 » The British Colony of Natal annexes Zululand.
Day of marriage June 9, 1921
The temperature on June 9, 1921 was between 11.0 °C and 18.2 °C and averaged 13.5 °C. There was 1.2 hours of sunshine (7%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 16 » The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa.
February 12 » Bolsheviks launch a revolt in Georgia as a preliminary to the Red Army invasion of Georgia.
February 27 » The International Working Union of Socialist Parties is founded in Vienna.
March 1 » The Australian cricket team captained by Warwick Armstrong becomes the first team to complete a whitewash of The Ashes, something that would not be repeated for 86 years.
March 20 » The Upper Silesia plebiscite was a plebiscite mandated by the Versailles Treaty to determine a section of the border between Weimar Germany and Poland.
October 29 » The Harvard University football team loses to Centre College, ending a 25-game winning streak. This is considered one of the biggest upsets in college football.
Day of death July 29, 1981
The temperature on July 29, 1981 was between 12.5 °C and 23.9 °C and averaged 18.0 °C. There was 5.6 hours of sunshine (36%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
April 11 » A massive riot in Brixton, south London results in almost 300 police injuries and 65 serious civilian injuries.
April 26 » Dr. Michael R. Harrison of the University of California, San Francisco Medical Center performs the world's first human open fetal surgery.
July 19 » In a private meeting with U.S. President Ronald Reagan, French President François Mitterrand reveals the existence of the Farewell Dossier, a collection of documents showing the Soviet Union had been stealing American technological research and development.
August 1 » MTV begins broadcasting in the United States and airs its first video, "Video Killed the Radio Star" by The Buggles.
September 3 » The Convention on the Elimination of All Forms of Discrimination Against Women, an international bill of rights for women, is instituted by the United Nations.
December 13 » General Wojciech Jaruzelski declares martial law in Poland, largely due to the actions by Solidarity.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I199642.php : accessed October 8, 2026), "Johanna Plieger (1897-1981)".
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