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1921 in science
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==Chemistry== * [[Étienne Biéler]] and [[James Chadwick]] publish a key paper on the [[strong interaction]].<ref>{{cite journal|title=The Collisions of Particles with Hydrogen Nuclei|journal=[[Philosophical Magazine]]|volume=42|issue=252|year=1921|pages=923–940|url=http://www.nssp.uni-saarland.de/lehre/Vorlesung/Kernphysik_SS14/History/Papers/Chadwick_Bieler.pdf|access-date=2014-08-31|archive-date=2014-08-19|archive-url=https://web.archive.org/web/20140819102746/http://www.nssp.uni-saarland.de/lehre/Vorlesung/Kernphysik_SS14/History/Papers/Chadwick_Bieler.pdf|url-status=dead}}</ref> * December 9 – [[Thomas Midgley Jr.|Thomas Midgley]] discovers the effective anti-knocking properties of [[tetraethyllead]], which is used in "leaded" [[gasoline]] (petrol).
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