1951 in science

• July 22 – Soviet space dogs Dezik and Tsygan become the first to enter space, in a 15-minute sub-orbital spaceflight from Kapustin Yar in an R-1 rocket, being safely parachuted back to earth.{{cite book|last=Siddiqi|first=Asif|title=Challenge to Apollo: The Soviet Union and the Space Race, 1945–1974|year=2000|publisher=NASA|page=95|url=https://www.nasa.gov/wp-content/uploads/static/history/SP-4408pt1.pdf}}

• Nesting pairs of the Bermuda petrel, thought to have been extinct for more than 300 years, are found.
• Niko Tinbergen publishes The Study of Instinct.

• May 28 – Oliver H. Lowry submits his Lowry protein assay procedure for publication.{{cite journal|author=Lowry, Oliver H.|last2=Rosebrough, Nira J.|last3=Farr, A. Lewis|last4=Randall, Rose J.|date=1951-11-01|title=Protein Measurement with the Folin Phenol Reagent|journal=Journal of Biological Chemistry|volume=193|issue=1|pages=265–75|doi=10.1016/S0021-9258(19)52451-6|pmid=14907713|doi-access=free}}
• October 15 – The progestin norethisterone, significant in creation of the combined oral contraceptive pill, is synthesized by Carl Djerassi, Luis E. Miramontes and George Rosenkranz at Syntex in Mexico City.

• February – Ferranti deliver their first Mark 1 computer to the University of Manchester (UK). It is the world's first commercially available general-purpose electronic computer.{{cite book|last1=Lavington|first1=Simon Hugh|last2=Society|first2=British Computer|title=A History of Manchester Computers|url=https://books.google.com/books?id=JRbESAAACAAJ|year=1998|publisher=British Computer Society|isbn=978-1-902505-01-5}}
• March 30 – Remington Rand delivers the first UNIVAC I computer to the United States Census Bureau. It is inaugurated on June 14.{{cite news|url=http://www.cnn.com/2001/TECH/industry/06/14/computing.anniversary/|publisher=CNN|title=50th anniversary of the UNIVAC I|access-date=2010-04-20|date=2001-06-14}}
• May 5 – The Ferranti NIMROD computer is presented at the Science Museum (London) during the Festival of Britain. It is designed exclusively to play Nim, using panels of lights, the first instance of a digital computer designed specifically to play a game.{{cite web|url=http://www.goodeveca.net/nimrod/|title=Welcome to Nimrod!|access-date=2011-06-21|archive-url=https://web.archive.org/web/20110723135752/http://www.goodeveca.net/nimrod/|archive-date=23 July 2011|url-status=live}}
• July – Maurice Wilkes introduces the concept of microprogramming.{{cite book|last=Wilkes|first=Maurice|chapter=The Best Way to Design an Automatic Computing Machine|title=Report of Manchester University Computer Inaugural Conference|year=1951|pages=16–18}}{{cite book|author1=Wilkes, M. V. |author2-link=David Wheeler (computer scientist) |author2=Wheeler, D. J. |author3-link=Stanley Gill |author3=Gill, S. |title=The preparation of programs for an electronic digital computer, with special reference to the EDSAC and the use of a library of subroutines|location=Cambridge, Massachusetts|year=1951|publisher=Addison-Wesley Press}}{{Cite journal | last1 = Wilkes | first1 = M. V. | title = The Growth of Interest in Microprogramming: A Literature Survey | doi = 10.1145/356551.356553 | journal = ACM Computing Surveys | volume = 1 | issue = 3 | pages = 139–145 | year = 1969 | s2cid = 10673679 | doi-access = free }}.
• November 29 – LEO becomes the first computer to run a full commercial business application, for the British bakers J. Lyons and Co.{{cite book|last=Ferry|first=Georgina|year=2004|title=A Computer Called LEO: Lyons Tea Shops and the World's First Office Computer|location=London|publisher=Harper Perennial|isbn=978-1-84115-186-1|chapter=4}}
• EDVAC binary electronic stored program computer incorporating high speed delay-line memory begins operation at the United States Army's Ballistics Research Laboratory at Aberdeen Proving Ground.{{cite book|last=Wilkes|first=M. V.|title=Automatic Digital Computers|publisher=Wiley|year=1956|location=New York}}
• Publication of Sancti Thomae Aquinatis hymnorum ritualium varia specimina concordantiarum ... A first example of word index automatically compiled and printed by IBM punched card machines, a concordance to work by Thomas Aquinas produced by IBM under the direction of Roberto Busa, an early instance of the use of data processing machinery in humanities research.

• July – The term "Industrial archaeology" is first used in print in Britain.{{cite journal|last=Rix|first=Michael|date=July 1951|title=Birmingham|journal=History Today|volume=1|issue=7|page=59}}
• Karl Huber's biography of Leibniz is published posthumously.
• Hans Reichenbach's book The Rise of Scientific Philosophy is published.University of California Press.

• Edward H. Simpson describes Simpson's paradox in statistics.{{cite journal|title=The Interpretation of Interaction in Contingency Tables|last=Simpson|first=Edward H.|year=1951|journal=Journal of the Royal Statistical Society, Series B|volume=13|issue=2 |pages=238–241|doi=10.1111/j.2517-6161.1951.tb00088.x }}{{cite journal|title=On Simpson's Paradox and the Sure-Thing Principle|first=Colin R.|last=Blyth|year=1972|journal=Journal of the American Statistical Association|volume=67|issue=338|pages=364–366|doi=10.2307/2284382|jstor=2284382}}

• August 15 – 1951 Pont-Saint-Esprit mass poisoning, a fatal outbreak, probably of ergotism, in southern France.
• Richard Asher describes Münchausen syndrome.{{cite journal|first=Richard|last=Asher|title=Munchausen's Syndrome|journal=The Lancet|volume=1|issue=6650|date=10 February 1951|pages=339–341|doi=10.1016/S0140-6736(51)92313-6|pmid=14805062}}
• The continental United States becomes malaria-free.{{cite web|url=https://edition.cnn.com/2014/03/25/health/scientists-eliminate-malaria/index.html?hpt=hp_c5|title=Scientists race to eliminate malaria as 'wonder drug' loses its powers|authorlink=Ed Yong|first=Ed|last=Yong|date=2014-03-25|work=CNN}}{{cite web|url=http://www.livescience.com/13694-devastating-infectious-diseases-smallpox-plague.html|title=7 Devastating Infectious Diseases|work=LiveScience.com|date=2020-02-10}}

• May 8 – Operation Greenhouse: The first thermonuclear weapon, developed by Edward Teller and Stanislaw Ulam, is tested in the "George" test on Enewetok Atoll in the Marshall Islands by the United States.

• Solomon Asch begins publication of his conformity experiments showing how group pressure can persuade an individual to conform to an obviously wrong opinion.
• The World Health Organization's report on maternal deprivation, Maternal Care and Mental Health, written by English psychologist John Bowlby, is published.{{cite journal|last=Bretherton|first=I.|title=The Origins of Attachment Theory: John Bowlby and Mary Ainsworth|year=1992|journal=Developmental Psychology|volume=28|issue=5|pages=759–775|doi=10.1037/0012-1649.28.5.759}}

• May – Carl A. Wiley publishes the concept of the solar sail.Writing as "Russel Saunders" in a fictional story "Are the Clipper Ships gone forever?" in Astounding Science-Fiction. {{cite journal|title=In Memory of Carl A. Wiley|journal=Antennas and Propagation Society Newsletter|volume=27|issue=3|pages=17–18|date=June 1985|first=Allan W.|last=Love|doi=10.1109/MAP.1985.27810}}
• June – Carl A. Wiley invents synthetic aperture radar.{{cite journal|title=Synthetic Aperture Radars: A Paradigm for Technology Evolution|first=C. A.|last=Wiley|journal=IEEE Transactions on Aerospace and Electronic Systems|volume=AES-21|issue=3|pages=440–443|date=May 1985|doi=10.1109/taes.1985.310578|bibcode=1985ITAES..21..440W|s2cid=6691398}}
• July 4 – William Shockley of Bell Labs in the United States announces the invention jointly with John Bardeen and Walter Brattain of the grown-junction transistor.{{cite web|url=http://www.computerhistory.org/semiconductor/timeline/1951-First.html|title=1951 – First Grown-Junction Transistors Fabricated|publisher=Computer History Museum|year=2007|access-date=2025-02-16|archive-url=https://web.archive.org/web/20120929202940/http://www.computerhistory.org/semiconductor/timeline/1951-First.html|archive-date=2012-09-29|url-status=live}} Also this year, General Electric and RCA develop the alloy-junction transistor.
• George Downing builds "The Rocket", the first surfboard with a removable fin.{{cite web|last1=Howard|first1=Jake|title=Saying Goodbye To The First Surfer To Turn A Board|url=https://stabmag.com/news/saying-goodbye-to-the-first-surfer-to-turn-a-board/|website=stabmag.com|access-date=2019-12-30|year=2018}}{{cite book|last=Marcus|first=Ben|title=365 Surfboards: The Coolest, Raddest, Most Innovative Boards from Around the World|date=2013-11-15|publisher=Voyageur Press|isbn=9781610588553|page=93|url=https://books.google.com/books?id=qFL0AwAAQBAJ&pg=PA93|access-date=2019-12-30}}

• August 18 – Indian Institute of Technology Kharagpur inaugurated in West Bengal as the first of the Indian Institutes of Technology.
• c. September – James Watson joins Francis Crick under Max Perutz in the UK Medical Research Council's Unit for Research on the Molecular Structure of Biological Systems at the Cavendish Laboratory in the University of Cambridge led by Sir Lawrence Bragg.

• Nobel Prizes
• Physics – John Douglas Cockcroft, Ernest Thomas Sinton Walton
• Chemistry – Edwin Mattison McMillan; Glenn Theodore Seaborg
• Medicine – Max Theiler
• Copley Medal: David Keilin
• Wollaston Medal for Geology – Olaf Holtedahl

• January 1 – Radia Perlman, American computer software designer and network engineer.
• March 21 – Martin Sweeting, English microsatellite pioneer.
• March 26 – Carl Wieman, American physicist, recipient of Nobel Prize in Physics 2001.{{cite book|last=Leroy|first=Francis|title=A century of Nobel Prizes recipients: chemistry, physics and medicine|publisher=Dekker|location=New York|year=2003|isbn=9780824708764|page=226}}
• April 14 – Greg Winter, English biochemist, recipient of Nobel Prize in Chemistry 2018.
• May – Chen Saijuan, Chinese molecular biologist.
• May 15 – Frank Wilczek, American physicist, recipient of Nobel Prize in Physics 2004.{{cite book|title=The Time Almanac|publisher=Information Please LLC|year=2011|page=75}}
• May 18 – Ben Feringa, Dutch organic chemist, recipient of Nobel Prize in Chemistry 2016.
• May 26 – Sally Ride (died 2012), American physicist and astronaut.
• July 1 – Niels Krabbe, Danish ornithologist.
• August 24 – Robin McLeod (died 2024), Canadian surgeon.
• September 14 – Duncan Haldane, English-born condensed-matter physicist, recipient of Nobel Prize in Physics 2016.
• September 18 – John Clark (died 2004), English molecular biologist.
• September 30 – Barry Marshall, Australian physician, recipient of Nobel Prize in Physiology or Medicine 2005.
• October 27 – Carlos Frenk, Mexican cosmologist.

• January 7 – Lucien Cuénot (born 1866), French biologist.
• January 13 – Dorothea Bate (born 1878), British paleozoologist.
• January 30 – Ferdinand Porsche (born 1875), German automobile engineer.
• March 19 – Jacob Christiaan Koningsberger (born 1867), Dutch biologist and politician.{{cite web|url=https://resources-huygens-knaw-nl.translate.goog/bwn1880-2000/lemmata/bwn5/koningsberger?_x_tr_sl=nl&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp|last=Doel|first=H.W. van den|title=Koningsberger, Jacob Christiaan (1867-1951)|language=nl|website=Huygens Institute for the History of the Netherlands|date=2013-11-12|access-date=2024-05-07|archive-url=https://web.archive.org/web/20190720101450/https://resources.huygens.knaw.nl/bwn1880-2000/lemmata/bwn5/koningsberger|archive-date=2019-07-20}}
• April 6 – Robert Broom (born 1866), Scottish-born South African paleontologist.
• April 9 – Vilhelm Bjerknes (born 1862), Norwegian physicist and meteorologist.
• April 22 – Horace Donisthorpe (born 1870), English entomologist.
• April 26 – Arnold Sommerfeld (born 1868), German physicist.
• May 5 – John Flynn (born 1880), Australian medical services pioneer.{{Cite web|url=https://www.flyingdoctor.org.au/about-the-rfds/history/john-flynn-bio/|title=John Flynn biography|website=Royal Flying Doctor Service}}
• May 16 – François Hussenot (born 1912), French aviation engineer, in aviation accident.
• October 4 – Henrietta Lacks (born 1921), African American source of the HeLa cell line.
• October 6 – Otto Fritz Meyerhof (born 1884), German-born physician and biochemist.
• December 11 – Christopher Addison, 1st Viscount Addison (born 1869), English anatomist and politician.

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Category:20th century in science

Category:1950s in science