March 1 » Henri Becquerel discovers radioactive decay.
May 26 » Nicholas II becomes the last Tsar of Imperial Russia.
June 28 » An explosion in the Newton Coal Company's Twin Shaft Mine in Pittston, Pennsylvania results in a massive cave-in that kills 58 miners.
August 30 » Philippine Revolution: After Spanish victory in the Battle of San Juan del Monte, eight provinces in the Philippines are declared under martial law by the Spanish Governor-General Ramón Blanco y Erenas.
December 14 » The Glasgow Underground Railway is opened by the Glasgow District Subway Company.
December 17 » Pittsburgh, Pennsylvania's Schenley Park Casino, which was the first multi-purpose arena with the technology to create an artificial ice surface in North America, is destroyed in a fire.
Day of death June 22, 1968
The temperature on June 22, 1968 was between 11.2 °C and 17.5 °C and averaged 14.8 °C. There was 0.9 hours of sunshine (5%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
February 16 » In Haleyville, Alabama, the first 9-1-1 emergency telephone system goes into service.
April 4 » Martin Luther King Jr. is assassinated by James Earl Ray at a motel in Memphis, Tennessee.
June 11 » Lloyd J. Old identified the first cell surface antigens that could differentiate among different cell types.
July 23 » The only successful hijacking of an El Al aircraft takes place when a Boeing 707 carrying ten crew and 38 passengers is taken over by three members of the Popular Front for the Liberation of Palestine. The aircraft was en route from Rome, to Lod, Israel.
September 13 » Cold War: Albania leaves the Warsaw Pact.
October 16 » Kingston, Jamaica is rocked by the Rodney riots, inspired by the barring of Walter Rodney from the country.
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/I108689.php : accessed October 18, 2026), "Jelle van der Zwaag (1896-1968)".
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