January 4 » Utah is admitted as the 45th U.S. state.
January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
March 1 » Henri Becquerel discovers radioactive decay.
June 2 » Guglielmo Marconi applies for a patent for his wireless telegraph.
September 22 » Queen Victoria surpasses her grandfather King George III as the longest reigning monarch in British history.
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
March 18 » Gold standard: The U.S. Congress repeals the requirement for a gold reserve to back US currency.
March 21 » Battle of Karameh in Jordan between the Israel Defense Forces and the combined forces of the Jordanian Armed Forces and PLO.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
September 13 » Cold War: Albania leaves the Warsaw Pact.
September 30 » The Boeing 747 is rolled out and shown to the public for the first time.
December 25 » Apollo program: Apollo 8 performs the first successful Trans-Earth injection (TEI) maneuver, sending the crew and spacecraft on a trajectory back to Earth from Lunar orbit.
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 17, 2026), "Jelle van der Zwaag (1896-1968)".
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