Editing 1940 in science (section)

==Computer science==
* January 8 – In the [[history of computing hardware]], [[Bell Labs]]' Complex Number Computer, a [[relay]]-based calculator for [[complex numbers]], is completed under the direction of [[George Stibitz]] in New York City.<ref>{{Ref patent|country=US|number=2668661|status=patent|title=Complex Computer|gdate=1954-02-09|assign1=[[American Telephone & Telegraph]]}}</ref>
* May–August – [[Alan Turing]] and [[Gordon Welchman]] at the United Kingdom [[Government Code and Cypher School]], [[Bletchley Park]], design the British [[Bombe]]s to help [[Cryptanalysis of the Enigma|decrypt]] [[Wehrmacht]] [[Enigma machine]] signals.<ref>{{cite book|last=Smith|first=Michael|authorlink=Michael Smith (newspaper reporter)|title=Station X: the Codebreakers of Bletchley Park|edition=rev.|series=Pan Grand Strategy Series|year=2007|publisher=Pan Macmillan|location=London|isbn=978-0-330-41929-1}}</ref>
* September 9 – George Stibitz first demonstrates remote operation of a computer, using a modified [[Teleprinter|teletype]] working over telegraph lines between an [[American Mathematical Society]] conference at [[Dartmouth College]] in New Hampshire and the Complex Number Computer in New York.<ref>{{cite book|last=Ritchie|first=David|date=1986|chapter=George Stibitz and the Bell Computers|title=The Computer Pioneers|url=https://archive.org/details/computerpioneers00ritc|url-access=registration|page=[https://archive.org/details/computerpioneers00ritc/page/39 39]|location=New York|publisher=Simon and Schuster|isbn=067152397X}}</ref><ref>{{cite book|url=https://books.google.com/books?id=AsvSBQAAQBAJ&q=%22Complex%20computer%22%201939&pg=PA481|title=History of Computing in the Twentieth Century|last=Metropolis|first=Nicholas|year=2014|publisher=Elsevier|isbn=9781483296685|page=481}}</ref><ref>{{cite web|last1=Dalakov|first1=Georgi|title=Relay computers of George Stibitz|url=http://history-computer.com/ModernComputer/Relays/Stibitz.html|website=History of Computers: Hardware, Software, Internet|accessdate=2015-03-30}}</ref>