Editing 1931 (section)

===January===
{{Main|January 1931}}
* [[January 2]] – [[South Dakota]] native [[Ernest Lawrence]] invents the [[cyclotron]], used to accelerate particles to study [[nuclear physics]].
* [[January 4]] – German pilot [[Elly Beinhorn]] begins her flight to Africa.
* [[January 22]] – Sir [[Isaac Isaacs]] is sworn in as the first Australian-born [[Governor-General of Australia]].
* [[January 25]] – [[Mohandas Gandhi]] is again released from imprisonment in India.<ref>{{Cite book|url=https://books.google.com/books?id=FauJL7LKXmkC&q=gandhi+prison1931&pg=PA127|title=Gandhi: The Man, His People, and the Empire|last=Gandhi|first=Rajmohan|date=2008|publisher=University of California Press|isbn=9780520255708|language=en}}</ref>
* [[January 27]] – [[Pierre Laval]] forms a government in France.
* [[January 30]] – [[Charlie Chaplin]] comedy drama film ''[[City Lights]]'' receives its public premiere at the [[Los Angeles Theater]] with [[Albert Einstein]] as guest of honor. Contrary to the current trend in cinema, it is a [[silent film]], but with a score by Chaplin. Critically and commercially successful from the start, it will place consistently in lists of films considered the best of all time.<ref>{{cite web|title=City Lights|url=https://www.loc.gov/static/programs/national-film-preservation-board/documents/city_lights.pdf|last=Vance|first=Jeffrey|publisher=[[Library of Congress]]|access-date=2021-01-09}}</ref>