Editing 1927 (section)

===October===
{{Main|October 1927}}
* [[October]] &ndash; [[Niels Bohr]] presents his theoretical principle of [[Complementarity (physics)|complementarity]] at the [[Solvay Conference#Fifth Conference|Fifth Solvay Conference on Physics]].<ref>{{cite book|author1=Jagdish Mehra|author2=Helmut Rechenberg|author-link1=Jagdish Mehra |author-link2=Helmut Rechenberg |title=The Probability Interpretation and the Statistical Transformation Theory, the Physical Interpretation, and the Empirical and Mathematical Foundations of Quantum Mechanics 1926–1932|url=https://books.google.com/books?id=CuOtQ4WjCP0C&pg=PA165|date=25 August 2000|publisher=Springer Science & Business Media|isbn=978-0-387-98971-6|pages=165}}</ref>
* [[October 4]] &ndash; Carving of the sculptures at [[Mount Rushmore]], [[South Dakota]], begins.
* [[October 6]] &ndash; ''[[The Jazz Singer]]'', starring [[Al Jolson]], premieres at the Warner Theater in New York City. Although not the first [[sound film]], and containing very little recorded speech, it is the first to become a box-office hit, popularizing "talkies" (although silent films continue to be made for some time).<ref name="Bryson2013">{{cite book|author-link=Bill Bryson|first=Bill|last=Bryson|title=One Summer: America, 1927|url=https://archive.org/details/isbn_9780767919401|url-access=registration|date=October 1, 2013|publisher=Knopf Doubleday Publishing Group|isbn=978-0-385-53782-7}}</ref>
* [[October 9]] &ndash; The Mexican government crushes a rebellion in [[Veracruz (city)|Veracruz]].
* [[October 18]] &ndash; The first flight of [[Pan American Airways]] takes off from [[Key West, Florida]], bound for [[Havana, Cuba]].
* [[October 25]] &ndash; The Italian [[ocean liner]] ''[[SS Principessa Mafalda|Principessa Mafalda]]'' capsizes off [[Porto Seguro]], Brazil; at least 314 people are killed.<ref>{{cite book|author=Karl Baarslag|title=Famous Sea Rescues Formerly Titled: SOS to the Rescue|url=https://books.google.com/books?id=6mYSXhDAIzQC|year=1948|publisher=Grosset & Dunlap|page=175}}</ref>