Editing 1880 in science (section)

==Mathematics==
* July – [[John Venn]] popularises [[Venn diagram]]s ("Eulerian circles").<ref>{{cite journal|last=Venn|first=J.|title=I. On the Diagrammatic and Mechanical Representation of Propositions and Reasonings|journal=[[The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science]]|volume=10|issue=59|date=July 1880|series=5|doi=10.1080/14786448008626877|pages=1–18|url=https://www.cis.upenn.edu/~bhusnur4/cit592_fall2014/venn%20diagrams.pdf|url-status=live|archive-url=https://web.archive.org/web/20170516204620/https://www.cis.upenn.edu/~bhusnur4/cit592_fall2014/venn%20diagrams.pdf|archive-date=2017-05-16}} [http://www.tandfonline.com/doi/abs/10.1080/14786448008626877] [https://books.google.com/books?id=k68vAQAAIAAJ&pg=PA1]</ref><ref>{{cite web|first=Ed|last=Sandifer|year=2003|title=How Euler Did It|url=http://www.maa.org/editorial/euler/How%20Euler%20Did%20It%2003%20Venn%20Diagrams.pdf|publisher=[[Mathematical Association of America]]|work=MAA Online|access-date=2009-10-26}}</ref>
* F. Landry finds the largest known [[Fermat prime]], [[65,537]].
* The [[United States Census Bureau]] first encounters the "[[Apportionment paradox#Alabama paradox|Alabama paradox]]".<ref>{{cite book|last=Stein|first=James D.|title=How Math Explains the World|location=New York|publisher=Smithsonian Books|year=2008|isbn=9780061241765|pages=228-31}}</ref>