The temperature on June 30, 1938 was between 9.8 °C and 18.6 °C and averaged 13.8 °C. There was 0.6 mm of rain during 0.6 hours. There was 3.7 hours of sunshine (22%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
February 11 » BBC Television produces the world's first ever science fiction television programme, an adaptation of a section of the Karel Čapek play R.U.R., that coined the term "robot".
March 3 » Oil is discovered in Saudi Arabia.
March 18 » Mexico creates Pemex by expropriating all foreign-owned oil reserves and facilities.
July 31 » Archaeologists discover engraved gold and silver plates from King Darius the Great in Persepolis.
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
December 17 » Otto Hahn discovers the nuclear fission of the heavy element uranium, the scientific and technological basis of nuclear energy.
When copying data from this family tree, please include a reference to the origin: W. Rovers, "Family tree Ro(o)vers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_rovers/I7737.php : accessed January 27, 2026), "Cornelis Johannes "Kees" van Hal (± 1911-)".
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