Italian mathematician (1977-) | Swiss Federal Institute of Technology in Lausanne, Polytechnic University of Milan | Sant'Angelo Lodigiano: April 20, 1977

mathematician (1977-1998) | Sharif University of Technology | Mashhad: April 20, 1977 - March 17, 1998 | Reza Sadeghi | Mashhad: April 20, 1977 - March 17

Italian Swiss physicist | Novi Ligure: April 20, 1976 - Venice: May 11, 2019 | Fabrizio Carbone | Novi Ligure: April 20, 1976 - Venice: May 11, 2019

German theologian | Karl Barth; A Life in Conflict | University of Tübingen | April 20, 1967 - Bonn: December 15, 1915 | Christiane Tietz - Christiane

Australian philosopher and cognitive scientist | Fellow of the American Academy of Arts and Sciences, Jean Nicod Prize (2015), Corresponding Fellow of the

Italian philosopher (1966-) | Grosseto: April 20, 1966 - Paris: January 10, 1843 | Geminello Preterossi | Grosseto: April 20, 1966 - Paris: January 10, 1843

German physicist | Cross of the Order of Merit of the Federal Republic of Germany, Bavarian Order of Merit, Emmy Noether Distinction for Women in Physics (2015)

Kazakh politician | Order of Parasat, Order of Kurmet | Kazakh National Agrarian University (1984), KIMEP University (1992) | Kazygurt District: April 20, 1962

Israeli inter-disciplinary researcher of Hebrew and comparative literature, philosophy and art | Bar-Ilan University | Jerusalem: April 20, 1960 - Chaillot

German physicist | Birkesdorf: April 20, 1957 - Beyenburg: March 4, 1922 | Michael Düren (Michael Duren) | Birkesdorf: April 20, 1957 - Beyenburg: March 4, 1922

American astronaut | Medal "For Merit in Space Exploration", NASA Space Flight Medal (2012), Eagle Scout, NASA Exceptional Service Medal (2010), NASA

German chemist and engineer | Dechema Prize (1994) | Essen: April 20, 1954 - Palo Alto: April 28, 1999 | Martin Stratmann | Essen: April 20, 1954 - Palo Alto

Italian physician | Bologna: April 20, 1953 - Ferrara: June 5, 2019 | Andrea Lenzi | Bologna: April 20, 1953 - Ferrara: June 5, 2019

American mathematician | Fellow of the American Mathematical Society (2013) | University of Michigan College of Literature, Science, and the Arts, Harvard University

Kharkiv State Academy of Culture | April 20, 1948 - March 6, 2021 | Volodymyr Otkydach | April 20, 1948 - March 6, 2021 | Kharkiv State Academy of Culture

Taiwanese physicist | California Institute of Technology, National Changhua Senior High School, National Taiwan University | Tianwei Township: April 20, 1947

American mathematician and academic | Fellow of the Society for Industrial and Applied Mathematics (2017), Steele Prize for Mathematical Exposition (2021)

Slovenian historian | Order of Freedom of the Republic of Slovenia (1996) | University of Ljubljana | Sodna Vas: April 20, 1944 - Ljubljana: April 19, 1714

Dutch physicist | Knight of the Order of the Netherlands Lion (2007) | University of Amsterdam, Leiden University, Sint-Nicolaaslyceum | Leiden: April 20, 1942

Italian American scholar, teacher, and feminist activist | Caliban and the Witch | University of Bologna, University at Buffalo | Parma: April 20, 1942

Russian scientist | Order of Friendship, Order of the Badge of Honour | Kamianets-Podilskyi Ivan Ohiienko National University | Kamianets-Podilskyi Raion

German physicist and historian of student | Cross of the Order of Merit of the Federal Republic of Germany | Hamm: April 20, 1938 - April 2, 2023 | Heinrich

British chemist, columnist and science writer | Imperial College London, Eltham College | United Kingdom: April 20, 1938 - Newcastle upon Tyne: July 19, 2017

American chemist | Alfred P. Sloan Fellow, Guggenheim Fellowship, Benjamin Franklin Medal (2009), Pfizer Award in Enzyme Chemistry (1977), Centenary Prize

German physicist and professor | honorary doctor of the University of Duisburg-Essen (1998) | Technical University of Munich | Karlsruhe: April 20, 1936

chemist (1933-2018) | Klettwitz: April 20, 1933 - March 30, 2018 | Herbert Richter | Klettwitz: April 20, 1933 - March 30, 2018

Russian scientist | Order of the Badge of Honour | Moscow Institute of Oriental Studies | Moscow: April 20, 1932 - Moscow: December 31, 2020 | Yury Galenovich

American scientist (1928–2005) | National Medal of Science (2001), Fellow of the American Geophysical Union, Tyler Prize for Environmental Achievement

Swiss physicist (1927–2023) | honorary doctorate from the University of Nice-Sophia Antipolis (1988), EPS Europhysics Prize (1988), honorary doctorate of the

American physicist (1925–2023) | Georgia Tech, University of Kentucky | Madisonville: April 20, 1925 - October 14, 2023 | Maurice W. Long | Madisonville

German mathematician (1924–2019) | Nordenham: April 20, 1924 - Oldenburg: October 11, 2019 | Heinrich Besuden | Nordenham: April 20, 1924 - Oldenburg: October 11, 2019

Czech Molecular biologist and professor at the Swiss Federal Institute of Technology (ETH) Zurich | Jerusalem: April 20, 1924 - Zurich: April 30, 1975 | Joseph

Mexican physicist (1921–2009) | Wigner Medal (1998), UNESCO Science Prize (1997), Fellow of the American Physical Society, National Prize for Arts and

researcher (1920-2019) | Medal "For Battle Merit", Order of Prince Yaroslav the Wise, 5th class, Medal "For the Victory over Germany in the Great Patriotic War

Swedish physicist (1918-2007) | Björkén Prize (1977), Nobel Prize in Physics (1981), Björkén Prize (1955), Sixten Heyman Award (1971), honorary doctorate

American nuclear physicist (1915–2006) | Golden Plate Award (1961), Ernest Orlando Lawrence Award (1960), Enrico Fermi Award (1980), Harvey Prize (1982)

American chemist | Garvan–Olin Medal (1965) | faculty of science, German University in Prague | Liberec: April 20, 1912 - New York City: September 9, 1974

Belgian philosopher (1905–1994) | Catholic University of Paris, University of Paris, Free University of Brussels, École Normale Supérieure | Genappe: April

German-American physicist | Fellow of the American Geophysical Union (1962), Arthur L. Day Medal (1979), John Adam Fleming Medal (1971), Carl Friedrich Gauss

Lithuanian military person | April 20, 1901 - Durham: February 4, 1994 | Juozas Vėbra (Juozas Vebra) | April 20, 1901 - Durham: February 4, 1994

German engineer (1901–1986) | Ludwig-Prandtl-Ring (1966) | Technical University of Braunschweig | Lübeck: April 20, 1901 - Boulder: November 3, 1986 | Adolf

American publisher, activist, and inventor of the bra (1892–1970) | Choate Rosemary Hall | New York City: April 20, 1892 - Rome: January 24, 1970 | Caresse

Ludwig-Maximilian-University in Munich | April 20, 1887 - October 23, 2002 | Max von Pidoll | April 20, 1887 - October 23, 2002

Azerbaijani journalist and physicist | Kazan Imperial University, 1st Baku Men Gymnasium | Zardab: April 20, 1886 - Baku: February 23, 1936 | Rahim bey Melikov

Faculty of History and Philology of St. Petersburg University | April 20, 1885 - Morristown: April 8, 1925 | D. V. Boldyrev | April 20, 1885 - Morristown

German chemist (1883–1936) | Laura R. Leonard Prize (1933) | Leipzig University | Leipzig: April 20, 1883 - Zurich: April 14, 1936 | Georg Wiegner | Leipzig

April 20, 1881 - Helsinki: November 18, 1919 | Viktor Jeločnik (Viktor Jelocnik) | April 20, 1881 - Helsinki: November 18, 1919

Danish mathematician and historian of mathematics (1874–1911) | Copenhagen: April 20, 1874 - Copenhagen: October 6, 1911 | Axel Anthon Bjørnbo (Axel Anthon

Croatian engineer and inventor (1871–1922) | TU Dresden | Liptovský Mikuláš: April 20, 1871 - Zagreb: February 5, 1922 | Slavoljub Eduard Penkala - Eduard

April 20, 1870 - Skopje: August 10, 2024 | Bartomeu Amat Brugada | April 20, 1870 - Skopje: August 10, 2024

Czech entrepreneur and inventor (1869-1921) | Vráž: April 20, 1869 - Prague: September 29, 1921 | František Vydra (Frantisek Vydra) | Vráž: April 20, 1869

French author, politician, poet, and critic (1868–1952) | Order of the Francisque (1943) | Mes idées politiques, Anthinéa, L’Avenir de l’intelligence

French astronomer | Legion of Honour | Lycée Thiers, École polytechnique | Marseille: April 20, 1862 - Saint-Cyr-sur-Mer: January 26, 1939 | Louis Fabry

1861–1914) | Franz Joseph University, John Sigismund Unitarian Academy | Aita Mare: April 20, 1861 - Cluj-Napoca: June 11, 1914 | Géza Nyiredy (Geza

American engineer (1860–1953) | Rumford Prize (1910), Holley Medal (1950) | New York Law School, Columbia University | Boston: April 20, 1860 - Suffolk

German chemist (1860–1920) | University of Göttingen, Humboldt University of Berlin, Leipzig University | Goslar: April 20, 1860 - Freiburg im Breisgau: June 20, 1920

Medical faculty of Moscow University | April 20, 1857 - Pyatigorsk: September 26, 1965 | Terenty Vyazemsky | April 20, 1857 - Pyatigorsk: September 26, 1965

American chemist (1854-1917) | Osterberg: April 20, 1854 - Portland: September 25, 1917 | Otto Saly Binswanger | Osterberg: April 20, 1854 - Portland: September 25, 1917

Russian chemist (1851-1918) | Imperial Academy of Medical Surgery, S. M. Kirov Military Medical Academy, University of Jena | Vladimir Governorate: April 20

Italian philosopher (1850-1933) | Gautieri Award (1909) | University of Pavia | Chiari: April 20, 1850 - Chiari: October 21, 1933 | Bernardino Varisco

German author, scientist and philosopher (1848–1910) | Two Planets | University of Wrocław | Wrocław: April 20, 1848 - Gotha: October 17, 1910 | Kurd

Italian mathematician (1839-1907) | Sapienza University of Rome | Rome: April 20, 1839 - Naples: May 31, 1907 | Francesco Siacci | Rome: April 20, 1839

German chemist and journalist | Szczecin: April 20, 1839 - Altkirchen: October 18, 1916 | Otto Dammer - Johann Gustav Eduard Otto Dammer | Szczecin: April 20

German chemist (1839-1925) | Davy Medal (1900) | University of Giessen | Kassel: April 20, 1839 - Milan: March 28, 1925 | Wilhelm Körner (Wilhelm Korner)

American academic (1836-1895) | Humboldt University of Berlin, Yale University, University of Marburg, Yale School of Engineering and Applied Science

American physician, chemist and 1st President of the University of Colorado Boulder | Doctor of Law (honorary) (1877) | Harvard School of Engineering and

German-American inventor (1818–1893) | Springe: April 20, 1818 - New York City: December 4, 1893 | Heinrich Göbel - Johann Heinrich Christoph Conrad Göbel

botanist (1817-1873) | University of Florence, University of Pisa | Pisa: April 20, 1814 - Casale Monferrato: July 1, 1872 | Ferdinando Rosellini | Pisa: April

Italian mathematician and politician (1812-1894) | University of Bologna | Budrio: April 20, 1812 - Bologna: December 18, 1894 | Quirico Filopanti - Giuseppe

Scottish physicist and glaciologist (1809–1868) | Bakerian Lecture (1846), Bakerian Lecture (1842), Keith Medal (1863), Royal Medal (1843), Fellow of the

French cleric-scientist (1804-1884) | Knight of the Legion of Honour (1866) | Guémené-sur-Scorff: April 20, 1804 - Saint-Denis: July 13, 1884

French engineer | 72 names on the Eiffel Tower, Knight of the Legion of Honour (1836), Officer of the Legion of Honour (1866) | Passerelle Marc-Seguin, Pont Marc Seguin

British Quaker businessman | April 20, 1776 - March 5, 1847 | William Weston Young | April 20, 1776 - March 5, 1847

German-born British publisher (1764-1834) | Stollberg: April 20, 1764 - Finchley: March 30, 1834 | Rudolph Ackermann | Stollberg: April 20, 1764 - Finchley

Swiss lens maker (1748-1824) | La Sagne: April 20, 1748 - Les Brenets: February 13, 1824 | Pierre-Louis Guinand (Guinand l'Opticien) | La Sagne: April 20, 1748

Spanish artist | Sertorian University building | Sertorian University of Huesca | Huesca: April 20, 1645 - Huesca: January 1, 1711 | Francisco de Artiga

German mathematician | Hamburg: April 20, 1644 - Hamburg: September 1, 1716 | Heinrich Meissner - Hinrich Meißner | Hamburg: April 20, 1644 - Hamburg: September 1, 1716