The temperature on April 5, 1911 was between -5.5 °C and 1.7 °C and averaged -2.2 °C. There was 7.7 hours of sunshine (58%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
June 28 » The Nakhla meteorite, the first one to suggest signs of aqueous processes on Mars, falls to Earth, landing in Egypt.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
November 19 » The Doom Bar in Cornwall claimed two ships, Island Maid and Angele, the latter killing the entire crew except the captain.
December 9 » A mine explosion near Briceville, Tennessee, kills 84 miners despite rescue efforts led by the United States Bureau of Mines.
Day of death April 30, 1968
The temperature on April 30, 1968 was between 5.4 °C and 14.6 °C and averaged 9.9 °C. There was 2.1 mm of rain during 1.1 hours. There was 1.6 hours of sunshine (11%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
March 6 » Three rebels are executed by Rhodesia, the first executions since UDI, prompting international condemnation.
April 11 » Assassination attempt on Rudi Dutschke, leader of the German student movement.
April 20 » English politician Enoch Powell makes his controversial "Rivers of Blood" speech.
April 29 » The controversial musical Hair, a product of the hippie counter-culture and sexual revolution of the 1960s, opens at the Biltmore Theatre on Broadway, with some of its songs becoming anthems of the anti-Vietnam War movement.
October 2 » Mexican President Gustavo Díaz Ordaz orders soldiers to suppress a demonstration of unarmed students, ten days before the start of the 1968 Summer Olympics.
December 31 » The first flight of the Tupolev Tu-144, the first civilian supersonic transport in the world.
When copying data from this family tree, please include a reference to the origin: Ellen Stempher-Hellwig, "Family tree Hellwig", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hellwig/R1151.php : accessed October 17, 2026), "Jef Jozef Johannes (Jef, Jozef Johannes) Drugman (1911-1968)".
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