Editing 1939 in science (section)

==Technology==
* January 1 – [[Hewlett-Packard]] is founded as an electronics company in [[Palo Alto, California]].
* January 11 – First flight of the [[Lockheed P-38 Lightning]] in the United States.
* August 27 – Flying the [[Heinkel He 178]], [[Erich Warsitz]] makes the first flight entirely on [[turbojet]] power (the [[Heinkel HeS 3|HeS 3]] [[jet engine]]).
* November 1–2 – [[Physicist]] [[Hans Ferdinand Mayer]] writes the [[Oslo Report]] on German weapons systems and passes it to the British [[Secret Intelligence Service]].
* December 29 – First flight of the Consolidated XB-24 "[[B-24 Liberator|Liberator]]" bomber prototype in the United States.
* [[Homer Dudley]] and Robert Riesz of [[Bell Labs]] in the United States publicly demonstrate the [[Voder]] (voice operating demonstrator) [[speech synthesis]] machine.
* [[Kirlian photography]] is invented by [[Semyon Kirlian]].
* American industrial psychologist [[Fritz Roethlisberger]], with William J. Dickson, publishes ''Management and the Worker: an account of a research program conducted by the Western Electric Company, Hawthorne works, Chicago''.