February 1 » Fountains Valley, Pretoria, the oldest nature reserve in Africa, is proclaimed by President Paul Kruger.
May 25 » The Republic of Formosa is formed, with Tang Jingsong as its president.
October 4 » Horace Rawlins wins the first U.S. Open Men's Golf Championship.
October 21 » The Republic of Formosa collapses as Japanese forces invade.
October 22 » In Paris an express train derails after overrunning the buffer stop, crossing almost 30 metres (100ft) of concourse before crashing through a wall and falling 10 metres (33ft) to the road below.
November 8 » While experimenting with electricity, Wilhelm Röntgen discovers the X-ray.
Day of death January 18, 1991
The temperature on January 18, 1991 was between -2.5 °C and 4.4 °C and averaged -0.1 °C. There was 6.7 hours of sunshine (80%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southeast. Source: KNMI
In The Netherlands , there was from Tuesday, November 7, 1989 to Monday, August 22, 1994 the cabinet Lubbers III, with Drs. R.F.M. Lubbers (CDA) as prime minister.
February 27 » Gulf War: U.S. President George H. W. Bush announces that "Kuwait is liberated".
April 29 » A cyclone strikes the Chittagong district of southeastern Bangladesh with winds of around 155 miles per hour (249km/h), killing at least 138,000 people and leaving as many as ten million homeless.
May 26 » Zviad Gamsakhurdia becomes the first elected President of the Republic of Georgia in the post-Soviet era.
August 25 » Linus Torvalds announces the first version of what will become Linux.
September 17 » The first version of the Linux kernel (0.01) is released to the Internet.
October 15 » The "Oh-My-God particle", an ultra-high-energy cosmic ray measured at 40,000,000 times that of the highest energy protons produced in a particle accelerator is observed at the University of Utah HiRes observatory in Dugway Proving Ground, Utah.
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/I68872.php : accessed December 26, 2025), "Jacob Slager (1895-1991)".
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