Editing 1920 in science (section)

==Technology==
* July 25 – The first transatlantic two-way radio broadcast is made.<ref>{{cite web|title=What happened on July 25|work=Dates in History|url=http://www.datesinhistory.com/jul25.php|accessdate=2012-01-09}}</ref>
* September 29 – First domestic radio sets come to stores in the United States – a [[Westinghouse Electric Corporation|Westinghouse]] radio costs $10. {{Citation needed|date=April 2015}}
* October – Young Russian physicist [[Léon Theremin|Lev Sergeyevich Termen]] first develops the [[electronic musical instrument]] which will become the [[Theremin]].<ref>{{cite book|last=Glinsky|first=Albert|title=Theremin: Ether Music and Espionage|location=Urbana|publisher=University of Illinois Press|year=2000|isbn=0-252-02582-2|page=[https://archive.org/details/thereminethermus00glin/page/n47 26]|url=https://archive.org/details/thereminethermus00glin|url-access=registration|accessdate=2012-01-09}}</ref>