Editing 1921 in science (section)

==Births==
* January 18 – [[Yoichiro Nambu]] (died [[2015 in science|2015]]), Japanese-American [[nuclear physicist]], recipient of the [[Nobel Prize in Physics]].
* February 3 – [[Ralph Asher Alpher]] (died [[2007 in science|2007]]), American cosmologist.
* March 11 – [[Léopold Reichling]] (died [[2009 in science|2009]]), [[Luxembourg]] [[biologist]] and [[naturalist]].
* April 19 – [[Michel Klein (veterinarian)|Michel Klein]] (died [[2024 in science|2024]]), Romanian-born French veterinarian.
* April 21 – [[John R. Huizenga]] (died [[2014 in science|2014]]), American nuclear physicist.
* April 30
** [[Roger L. Easton]] (died [[2014 in science|2014]]), American [[physicist]], principal inventor of the [[Global Positioning System]].
** [[Ralph A. Lewin]] (died [[2008 in science|2008]]), Anglo-American [[biologist]], "the father of green algae genetics".
** [[Jennifer Moyle]] (died [[2016 in science|2016]]), English research biochemist.
* May 18
** [[Anthony Epstein]] (died 2024), British pathologist.
** [[Olgierd Zienkiewicz]] (died 2009), British [[civil engineer]].
* June 1 – [[Giuliana Tesoro]] (died [[2002 in science|2002]]), Italian-American [[organic chemist]].
* June 9 – [[Forrest Bird]] (died [[2015 in science|2015]]), American [[biomedical engineer]].
* June 14 – [[George Rédei]] (died 2008), [[Hungarian people|Hungarian]] [[biologist]].
* June 15 – [[Gavriil Ilizarov]] (died [[1992 in science|1992]]), [[Poland|Polish]]-born [[orthopedic surgeon]].
* June 26 – [[Anne Beloff-Chain]] (died 1991), British [[biochemist]].
* July 4 – [[Aron Arthur Moscona]] (died 2009), American [[Developmental biology|developmental biologist]].
* July 18
** [[Aaron T. Beck]] (died [[2021 in science|2021]]), American [[psychiatrist]], "father of [[cognitive therapy]]".<ref>{{cite book|author1=Smith, Vicki|author2=Collard, Patrizia|author3=Nicolson, Paula|title=Key Concepts In Counselling And Psychotherapy: A Critical A-Z Guide To Theory|url=https://books.google.com/books?id=gCzEuAlW2vcC&pg=PA21|date=2012|publisher=McGraw-Hill Education (UK)|isbn=978-0-335-24221-4|page=21}}</ref>
** [[John Glenn]] (died [[2016 in science|2016]]), American [[astronaut]].
* August 16 – [[Rudolf Trümpy]] (died 2009), [[Swiss people|Swiss]] [[geologist]].
* October 5 – [[Mahlon Hoagland]] (died 2009), American biochemist, discoverer of [[transfer RNA]] (tRNA).
* October 18 – [[Beatrice Helen Worsley]] (died [[1972 in science|1972]]), Mexican-born Canadian [[computer scientist]].
* October 21 – [[Victor A. McKusick]] (died 2008), American "father of genetic medicine".
* December 2 – [[Isabella Karle]] (died [[2017 in science|2017]]), American physical chemist