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DTSTART:20250330T010000
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DTSTART:20251026T010000
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DTSTART:20260329T010000
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20260630
DTEND;VALUE=DATE:20260706
DTSTAMP:20260701T080514Z
CREATED:20260630T015641Z
LAST-MODIFIED:20260701T080514Z
UID:142088-1782777600-1783295999@www.a3veen.nl
SUMMARY:Royal Society #SummerScience Exhibition 2026 (TV YouTube webcast)
DESCRIPTION:Meet world-leading researchers from universities and science institutions across the UK at the Royal Society’s free annual celebration of cutting-edge science. \nLinks:\nSummer Science Exhibition
URL:https://www.a3veen.nl/event/summerscience-exhibition-2026/
LOCATION:The Royal Institution of Great Britain\, 21 Albemarle Street\, London\, Verenigd Koninkrijk
CATEGORIES:kennis,STEM
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260701
DTEND;VALUE=DATE:20260702
DTSTAMP:20260701T080657Z
CREATED:20260701T080636Z
LAST-MODIFIED:20260701T080657Z
UID:142100-1782864000-1782950399@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260701/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260702
DTEND;VALUE=DATE:20260703
DTSTAMP:20260702T090805Z
CREATED:20260702T090805Z
LAST-MODIFIED:20260702T090805Z
UID:142131-1782950400-1783036799@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260702/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260703
DTEND;VALUE=DATE:20260704
DTSTAMP:20260703T073248Z
CREATED:20260703T073248Z
LAST-MODIFIED:20260703T073248Z
UID:142176-1783036800-1783123199@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260703/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260704
DTEND;VALUE=DATE:20260705
DTSTAMP:20260704T135513Z
CREATED:20260704T135513Z
LAST-MODIFIED:20260704T135513Z
UID:142230-1783123200-1783209599@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260704/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260705
DTEND;VALUE=DATE:20260706
DTSTAMP:20260705T165959Z
CREATED:20260705T065916Z
LAST-MODIFIED:20260705T165959Z
UID:142262-1783209600-1783295999@www.a3veen.nl
SUMMARY:Newton\, Principia Mathematica - publicatie (1687)
DESCRIPTION:Philosophiae Naturalis Principia Mathematica (Lat.: “De wiskundige beginselen van de natuurfilosofie”\, kortweg de Principia) is een werk van Isaac Newton gepubliceerd op 5 juli 1687. \nBekend is dat Newton het werk van ruim 500 pagina’s schreef tussen augustus 1684 en april 1686 (minder dan twee jaar dus) naar aanleiding van een bezoek dat Edmond Halley aan hem bracht. Het is echter zeer waarschijnlijk dat hij zijn ideeën erover al eerder ontwikkelde omdat hij tegenover Halley gewag maakte van zijn oplossing voor het probleem van de banen van de planeten (de reden voor Halley’s bezoek). Al in november 1684 zond hij hem en de Royal Society een uitgewerkte wiskundige beschrijving daarvan\, onder de titel De motu corporum in gyrum (Over de beweging van lichamen in een baan)\, een artikel van negen pagina’s. Hierop liet Halley weten dat de Royal Society graag meer van zulk werk zou ontvangen\, en het ook zou uitgeven. Volgens ooggetuigen werkte Newton vervolgens bijna dag en nacht aan het boek. Toen Newton de Principia afgerond had\, had de Royal Society echter net haar hele budget gespendeerd aan de uitgave van De historia piscium\, een boek over vissen\, geschreven door Francis Willughby. Dat boek verkocht zeer slecht\, en uiteindelijk financierde Edmond Halley de eerste druk van de Principia. Het werk is een van de invloedrijkste publicaties ooit verschenen in de exacte wetenschappen. \nLinks:\nPhilosophiæ naturalis principia mathematica
URL:https://www.a3veen.nl/event/newton-principia-mathematica-publicatie-1687/
CATEGORIES:Biologie,Boeken,Cultuur,kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260706
DTEND;VALUE=DATE:20260707
DTSTAMP:20260706T081534Z
CREATED:20260706T081534Z
LAST-MODIFIED:20260706T081534Z
UID:142284-1783296000-1783382399@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260706/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260707
DTEND;VALUE=DATE:20260708
DTSTAMP:20260707T085239Z
CREATED:20260707T085239Z
LAST-MODIFIED:20260707T085239Z
UID:142335-1783382400-1783468799@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260707/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260708
DTEND;VALUE=DATE:20260709
DTSTAMP:20260708T074348Z
CREATED:20260708T074348Z
LAST-MODIFIED:20260708T074348Z
UID:142388-1783468800-1783555199@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260708/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260709
DTEND;VALUE=DATE:20260710
DTSTAMP:20260709T075940Z
CREATED:20260709T075940Z
LAST-MODIFIED:20260709T075940Z
UID:142412-1783555200-1783641599@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260709/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260710
DTEND;VALUE=DATE:20260711
DTSTAMP:20260710T073503Z
CREATED:20260710T073503Z
LAST-MODIFIED:20260710T073503Z
UID:142455-1783641600-1783727999@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260710/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260710
DTEND;VALUE=DATE:20260713
DTSTAMP:20260710T085331Z
CREATED:20260708T222814Z
LAST-MODIFIED:20260710T085331Z
UID:142425-1783641600-1783900799@www.a3veen.nl
SUMMARY:Tuinvlindertelling 2026
DESCRIPTION:Welke soorten vlinders vliegen er in jouw tuin? Tel mee met de tuinvlindertelling en help de vlinders beter in kaart te brengen! \nLoop tijdens de tellingdagen een rondje door de tuin en noteer gedurende 15 minuten alle vlinders die je ziet. Maar tel deze waarnemingen niet bij elkaar op\, want dan kan het zijn dat je vlinders twee keer telt. Geef van elke vlindersoort het hoogste aantal door in het telformulier dat je tegelijk hebt gezien. Voorbeeld: je ziet eerst 3 dagpauwogen tegelijk. Tien minuten later zijn er weer 2 dagpauwogen. Dan geef je door: 3 dagpauwogen. Zie je later op de dag of één van de andere teldagen weer vlinders? Dan kun je die doorgeven via een nieuwe telling. Heb je een vlinder gezien die niet in de tellijst staat? Dat kan; we tellen alleen de meest voorkomende soorten tuinvlinders. Je hoeft deze waarneming dan niet in te vullen. Belangrijk: als je geen vlinders ziet is het ook belangrijk om dit door te geven. Deze data zijn net zo belangrijk als tellingen waar wel vlinders gezien zijn. Vul dan ‘0 dagvlinders gezien’ in in het telformulier. \nLinks:\nTuinvlindertelling
URL:https://www.a3veen.nl/event/tuinvlindertelling-2026/
LOCATION:Nederland\, Nederland
CATEGORIES:Burgerwetenschap,Dierenrechten,kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260711
DTEND;VALUE=DATE:20260712
DTSTAMP:20260711T185904Z
CREATED:20260710T225729Z
LAST-MODIFIED:20260711T185904Z
UID:142496-1783728000-1783814399@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260711/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260711T160000
DTEND;TZID=Europe/Amsterdam:20260711T230000
DTSTAMP:20260711T190556Z
CREATED:20260710T224339Z
LAST-MODIFIED:20260711T190556Z
UID:142494-1783785600-1783810800@www.a3veen.nl
SUMMARY:Space\, mountains\, oceans: Science at the frontiers of exploration (TV CERN webcast)
DESCRIPTION:On Saturday 11 July 2026\, join us at CERN Science Gateway from 16:00 onwards for an evening celebrating curiosity and discovery. \nFrom space to oceans\, to artificial intelligence\, cosmic rays and the search for life in the Universe\, “Future Explorers” will bring together scientists\, engineers\, astronauts\, sailors\, and artists to explore the frontiers of the unknown. \nLinks:\nCERN
URL:https://www.a3veen.nl/event/space-mountains-oceans-science-at-the-frontiers-of-exploration-tv-cern-webcast/
CATEGORIES:kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260712
DTEND;VALUE=DATE:20260713
DTSTAMP:20260712T133220Z
CREATED:20260711T232940Z
LAST-MODIFIED:20260712T133220Z
UID:142505-1783814400-1783900799@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260712/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260713
DTEND;VALUE=DATE:20260714
DTSTAMP:20260721T112448Z
CREATED:20260713T011157Z
LAST-MODIFIED:20260721T112448Z
UID:142810-1783900800-1783987199@www.a3veen.nl
SUMMARY:Citizen science platforms must mitigate against the threat of generative AI - publication
DESCRIPTION:In the commentary ‘Citizen science platforms must mitigate against the threat of generative AI’ in the science journal Nature\, researchers warned that hundreds of fake images have already been discovered on popular databases for recording species\, they said that the true scale of the issue is unknown – as many could go undetected – and could contaminate records collected by the public. \nLinks:\nAI-altered images on birdwatching forums putting research at risk
URL:https://www.a3veen.nl/event/citizen-science-platforms-must-mitigate-against-the-threat-of-generative-ai-publication/
CATEGORIES:Bibliotheek,Burgerwetenschap,kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260713
DTEND;VALUE=DATE:20260714
DTSTAMP:20260713T083757Z
CREATED:20260713T083757Z
LAST-MODIFIED:20260713T083757Z
UID:142524-1783900800-1783987199@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260713/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260714
DTEND;VALUE=DATE:20260715
DTSTAMP:20260714T110604Z
CREATED:20260714T110604Z
LAST-MODIFIED:20260714T110604Z
UID:142560-1783987200-1784073599@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260714/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260715
DTEND;VALUE=DATE:20260716
DTSTAMP:20260715T092047Z
CREATED:20260715T092003Z
LAST-MODIFIED:20260715T092047Z
UID:142585-1784073600-1784159999@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260715/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260716
DTEND;VALUE=DATE:20260717
DTSTAMP:20260716T101247Z
CREATED:20260716T101247Z
LAST-MODIFIED:20260716T101247Z
UID:142615-1784160000-1784246399@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260716/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260717
DTEND;VALUE=DATE:20260718
DTSTAMP:20260717T085245Z
CREATED:20260717T085245Z
LAST-MODIFIED:20260717T085245Z
UID:142656-1784246400-1784332799@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260717/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260717T170000
DTEND;TZID=Europe/Amsterdam:20260717T200000
DTSTAMP:20260717T191100Z
CREATED:20260716T230815Z
LAST-MODIFIED:20260717T191100Z
UID:142674-1784307600-1784318400@www.a3veen.nl
SUMMARY:Most Of The Universe Is Missing And We Don't Know Why (TV New Scientist webcast)
DESCRIPTION:Everything you see\, touch and are built from is a minority of what the universe is actually made of\, and the closer physics looks at the rest\, the less the picture holds together. \nIn 3 hours\, we move outwards through that problem: from the 85 per cent of matter that is invisible\, to the visible matter whose textbook description is admittedly unfinished\, to a dimension of space that scientists are now building by hand in a lab\, and finally to the question of whether we can ever truly know what reality is made of at all. \nLinks:\nWhat If Dark Energy Comes From Space-Time Itself?
URL:https://www.a3veen.nl/event/most-of-the-universe-is-missing-and-we-dont-know-why-tv-new-scientist-webcast/
CATEGORIES:Astronomie,Fysica,kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260718
DTEND;VALUE=DATE:20260719
DTSTAMP:20260718T152753Z
CREATED:20260718T152753Z
LAST-MODIFIED:20260718T152753Z
UID:142709-1784332800-1784419199@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260718/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260719
DTEND;VALUE=DATE:20260720
DTSTAMP:20260720T073054Z
CREATED:20260719T072919Z
LAST-MODIFIED:20260720T073054Z
UID:142735-1784419200-1784505599@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260719/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260720
DTEND;VALUE=DATE:20260721
DTSTAMP:20260720T073244Z
CREATED:20260720T073244Z
LAST-MODIFIED:20260720T073244Z
UID:142737-1784505600-1784591999@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260720/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260721
DTEND;VALUE=DATE:20260722
DTSTAMP:20260728T080328Z
CREATED:20260721T075123Z
LAST-MODIFIED:20260728T080328Z
UID:142998-1784592000-1784678399@www.a3veen.nl
SUMMARY:The State of Food Security and Nutrition in the World 2026
DESCRIPTION:Global hunger declined for a third consecutive year in 2025\, demonstrating that progress is possible. However\, the improvements remain fragile\, unevenly distributed and insufficient to achieve the Sustainable Development Goals by 2030\, according to The State of Food Security and Nutrition in the World 2026 (SOFI 2026) report\, released on Tuesday by five United Nations specialized agencies. \nThe report estimates that 7.8 percent of the global population faced hunger in 2025\, down from 8.1 percent in 2024 and 8.6 percent in 2022\, confirming a sustained\, albeit slow\, improvement. This means that around 645 million people were affected by hunger in 2025\, representing a reduction of nearly 14 million compared to 2024 and 43 million compared to 2022. Despite global progress\, recovery remains uneven across regions. Asia\, together with Latin America and the Caribbean\, has recorded steady improvements in recent years. In contrast\, Africa is now home to approximately 309 million hungry people\, compared with 292 million in Asia. Although Africa’s previously rising trend is beginning to stabilize\, with the share of its population facing hunger decreasing from 20.3 percent in 2024 to 20.0 percent in 2025\, the continent now has the highest number of hungry people in absolute terms amid a rapidly growing population. Broader measures of food access tell a similar story. In 2025\, an estimated 25.8 percent of the global population (around 2.1 billion people) experienced moderate or severe food insecurity\, meaning they were at times forced to compromise on the quality or quantity of the food they ate. This is down from 27.1 percent in 2024 and 28.7 percent in 2020 – equivalent to nearly 86 million fewer people than in 2024 and 135 million fewer than in 2020\, though still above pre-pandemic levels. Regional disparities remain stark. More than half of Africa’s population (56.6 percent) faced moderate or severe food insecurity in 2025\, compared to 20.3 percent in Asia\, 22.9 percent in Latin America and the Caribbean\, and 8.7 percent in Northern America and Europe. Food insecurity also continues to be more prevalent in rural areas than in peri-urban and urban areas\, while women remain disproportionately affected\, although the gender gap narrowed slightly in 2025. \nLinks:\nThe State of Food Security and Nutrition in the World 2026
URL:https://www.a3veen.nl/event/the-state-of-food-security-and-nutrition-in-the-world-2026/
CATEGORIES:Bibliotheek,Culinair,kennis,Maatschappij,UN,Voedselproductie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260721
DTEND;VALUE=DATE:20260722
DTSTAMP:20260721T090826Z
CREATED:20260721T090756Z
LAST-MODIFIED:20260721T090826Z
UID:142801-1784592000-1784678399@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260721/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260722
DTEND;VALUE=DATE:20260723
DTSTAMP:20260722T154327Z
CREATED:20260722T154327Z
LAST-MODIFIED:20260722T154327Z
UID:142821-1784678400-1784764799@www.a3veen.nl
SUMMARY:Pi Approximation Day / Pi-benaderingsdag 2026
DESCRIPTION:Pi Approximation Day is observed every year on July 22 all around the world. \nThe fraction 22/7 is an approximate value of Pi\, and there behind lays a specific reason why this day is observed on July 22. This day is celebrated on July 22 every year because the value of Pi is denoted by the fraction 22/7. Here\, in the fraction 22/7 which denoted Pi\, the numerator 22 symbolizes the date (22nd day of the month) and numerator 7 indicates the month (July). Approximations for the mathematical constant pi (π) in the history of mathematics reached an accuracy within 0.04% of the true value before the beginning of the Common Era. In Chinese mathematics\, this was improved to approximations correct to what corresponds to about seven decimal digits by the 5th century. Further progress was not made until the 14th century\, when Madhava of Sangamagrama developed approximations correct to eleven and then thirteen digits. Jamshīd al-Kāshī achieved sixteen digits next. Early modern mathematicians reached an accuracy of 35 digits by the beginning of the 17th century (Ludolph van Ceulen)\, and 126 digits by the 19th century (Jurij Vega)\, surpassing the accuracy required for any conceivable application outside of pure mathematics. The record of manual approximation of π is held by William Shanks\, who calculated 527 decimals correctly in 1853. Since the middle of the 20th century\, the approximation of π has been the task of electronic digital computers (for a comprehensive account\, see Chronology of computation of π). On June 28\, 2024\, the current record was established by the StorageReview Lab team with Alexander Yee’s y-cruncher with 202 trillion (2.02×1014) digits. \nLinks:\nPi Approximation Day History\, Meaning\, Significance\, other Celebration ideas
URL:https://www.a3veen.nl/event/pi-approximation-day-pi-benaderingsdag-2026/
CATEGORIES:kennis,STEM,Wiskunde
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260722
DTEND;VALUE=DATE:20260723
DTSTAMP:20260722T155510Z
CREATED:20260722T155451Z
LAST-MODIFIED:20260722T155510Z
UID:142827-1784678400-1784764799@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260722/
CATEGORIES:Geschiedenis
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260723
DTEND;VALUE=DATE:20260724
DTSTAMP:20260723T085824Z
CREATED:20260723T085824Z
LAST-MODIFIED:20260723T085824Z
UID:142848-1784764800-1784851199@www.a3veen.nl
SUMMARY:In de geschiedenis
DESCRIPTION:Links:\nWikipedia
URL:https://www.a3veen.nl/event/in-de-geschiedenis-20260723/
CATEGORIES:Geschiedenis
END:VEVENT
END:VCALENDAR