1919 in science,
other events of 1920,
1921 in science and the
list of years in science.
Andrew Douglass proposes dendrochronology dating.
Milutin Milankovic proposes that long term climatic cycles may be due to changes in the eccentricity of the Earth's orbit and changes in the Earth's obliquity.
Meghnad Saha states his ionization equation
The first transatlantic two-way radio broadcast is made.
First domestic radio sets come to stores in USA – Westinghouse radio costs $10
January 2 - Isaac Asimov, future author
February 7 - An Wang, future computer designer
June 14 - Max Weber, sociologist
Charles Edouard Guillaume is awarded the Nobel Prize for Physics
Schack August Steenberg Krogh is awarded the Nobel Prize for Medicine
Walther Hermann Nernst is awarded the Nobel Prize for Chemistry