Editing Timeline of historic inventions (section)

====1940-1944====
* '''1940:''' [[Isotopes of plutonium#Notable isotopes|Pu-239 isotope]] (isotope of [[plutonium]])<ref name=t2>[https://www.armscontrol.org/act/1997-11/features/technology-nuclear-weapons The Technology of Nuclear Weapons], [[Arms Control Association]], accessed 9 January 2020</ref><ref name="t3">[http://www.radioactivity.eu.com/site/pages/Plutonium_239.htm Plutonium 239] {{Webarchive|url=https://web.archive.org/web/20200118091017/http://www.radioactivity.eu.com/site/pages/Plutonium_239.htm |date=18 January 2020 }}, EDP-Sciences (EDITIONS DE PHYSIQUE) (& the Institut National de Physique Nucléaire et Physique des Particules (IN2P3) accessed 9 January 2020</ref> a form of matter existing with the capacity for use as a destructive element<ref>[https://www.atomicheritage.org/history/plutonium Plutonium], published by the [[Atomic Heritage Foundation]] & the [[National Museum of Nuclear Science & History]] (of the [[United States]]) 5 June 2014 – accessed 2020-1-9, re-accessed due to an error in application during 9, 10 January 2020</ref> (because the isotope has an exponentially increasing<ref name=t2 /> spontaneous<ref>{{Cite book | publisher=Springer | location=Berlin, Heidelberg | chapter-url=https://link.springer.com/chapter/10.1007%2F978-3-642-55764-4_8 | title=Nuclides.net | doi=10.1007/978-3-642-55764-4_8 | isbn=978-3-642-62817-7 | chapter=Fission Products and Yields ϒ | date=2003 | last1=Magill | first1=Joseph | pages=187–196 }}</ref> [[spontaneous fission|fissile]] decay<ref>[[Emilio Segre|Segre, Emilio]] — [https://escholarship.org/content/qt8v41m1pb/qt8v41m1pb.pdf Spontaneous Fission] p.13 "From this we deduce a spontaneous fission decay constant of 2.1 x l0<sup>3</sup> fissions per gram per second". published [[Lawrence Berkeley National Laboratory]], University of California, 22 November 1950 (this source represents a re-application of sourcing due to an [https://en.wikipedia.org/w/index.php?title=List_of_discoveries_by_disciplines&oldid=934934652#Technological error in application of sourcing to the inclusion " fission" (+) "decay" during the 1st inclusion made 2020-1-9])</ref>) within [[nuclear devices]] — [[Glenn Seaborg]].<ref name=t3 />
* '''1940:''' [[John Randall (physicist)|John Randall]] and [[Harry Boot]] would develop the high power, microwave generating, [[cavity magnetron]], later applied to commercial [[Radar]] and [[Microwave oven]] appliances.<ref>{{Cite web |title=The Magnetron |url=http://histru.bournemouth.ac.uk/Oral_History/Talking_About_Technology/radar_research/the_magnetron.html |access-date=28 February 2022 |website=histru.bournemouth.ac.uk}}</ref>
* '''1941:''' [[Polyester]] is invented by [[John Rex Whinfield]] and James Dickson.<ref>{{cite web|last1=Bellis|first1=Mary|title=The History of Polyester|url=http://inventors.about.com/od/famousinventions/fl/The-History-of-Polyester.htm|website=About.com|access-date=23 February 2017}}{{Dead link|date=August 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
* '''1942:''' The [[V-2 rocket]], the world's first long range [[ballistic missile]], developed by engineer [[Wernher von Braun]].
* '''1944:''' The non-infectious viral vaccine is perfected by Dr. Jonas Salk and Thomas Francis.<ref>Bookchin, Debbie and Schumacher, Jim. The Virus and the Vaccine. MacMillan 2005</ref>