rector at Tel Aviv University | IEEE Fellow (2016), Fellow of the Optical Society (2010) | Technion – Israel Institute of Technology | Chișinău: April 21

Italian physicist | Venice: April 21, 1963 - December 21, 1918 | Achille Stocchi | Venice: April 21, 1963 - December 21, 1918

researcher | Merited Scientist of the Russian Federation, Order of Pirogov, Russian government prize for science and technology | Moscow: April 21, 1962

Polish physicist | University of Gdańsk | Gdynia: April 21, 1960 - November 25, 2023 | Mirosław Miętus (Miroslaw Mietus) | Gdynia: April 21, 1960 - November 25, 2023

French writer and linguist | Prix de l'Humour noir (2013), Prix Goncourt (2020) | Paris Diderot University, Centre de formation des journalistes | Paris: April

University of Warsaw | April 21, 1955 - Warsaw: February 1, 1990 | Leszek Gawor | April 21, 1955 - Warsaw: February 1, 1990 | University of Warsaw

American chemist | Peter Debye Award in Physical Chemistry (2000), Fellow of the American Physical Society, Guggenheim Fellowship, ACS Award in Pure Chemistry

Romanian-New Zealand mathematician and computer scientist | University of Bucharest | Galați: April 21, 1952 - Rome: May 20, 1893 | Cristian Calude | Galați

Mathematician and Fields Medalist at Microsoft Station Q | Fellow of the American Academy of Arts and Sciences, Fellow of the American Mathematical Society

Russian-American writer | Andrei Biely Prize | Philological Faculty of Moscow State University | Moscow: April 21, 1950 - Northfield: December 22, 1899

Palestinian Minister of Education | Lehigh University, American University of Beirut | Anabta: April 21, 1949 - May 17, 1899 | Marwan Awartani - مروان

Hungarian-American physician | Semmelweis University | Budapest: April 21, 1946 - Hollywood: December 31, 2014 | Ferenc A. Jolesz | Budapest: April 21, 1946

Polish mathematician (1946–1998) | Wrocław University of Science and Technology | Tomaszów Mazowiecki: April 21, 1946 - Wrocław: August 28, 1998 | Anzelm

Italian catholic archbishop | Order of Holy Prince Daniel of Moscow 3rd class | Pontifical Roman Seminary, Pontifical Lateran University | Boville Ernica

Russian physicist | MSU Faculty of Physics | Donetsk: April 21, 1944 - Sergiyev Posad: December 15, 1891 | Alexander Kuzemsky | Donetsk: April 21, 1944

German writer | MSU Faculty of Physics, Moscow State University | Moscow: April 21, 1944 - Yerevan: May 14, 1978 | Boris Shapiro | Moscow: April 21, 1944

British chemist | Gabor Medal (1991), Bijvoet Medal (2008), Fellow of the Academy of Medical Sciences, EMBO Membership, Royal Medal (2008), honorary doctorate

April 21, 1942 - Lviv: February 24, 1926 | Joseph Opeyda | April 21, 1942 - Lviv: February 24, 1926

Brazilian physicist | University of São Paulo | São Paulo: April 21, 1942 - Manchester: January 1, 1986 | Wilson Silva (Rodrigues) | São Paulo: April 21

German mathematician | University of Göttingen | April 21, 1940 - August 11, 2021 | Günther Trautmann (Gunther Trautmann) | April 21, 1940 - August 11, 2021

Israeli chemist | Technion – Israel Institute of Technology | Bucharest: April 21, 1940 - Beaucaire: March 26, 1883 | Moti Dariel | Bucharest: April 21, 1940

American physicist (1940-2002) | Princeton University | Philadelphia: April 21, 1940 - Coral Gables: January 9, 2002 | Fred Tappert | Philadelphia: April 21

German mathematician and historian of mathematics (1934–2013) | University of Erlangen–Nuremberg | Selb: April 21, 1934 - July 19, 2013 | Wolfgang Schwarz

Italian philosopher (1934-) | Presicce: April 21, 1934 - Paris: October 15, 1937 | Riccardo Campa | Presicce: April 21, 1934 - Paris: October 15, 1937

Czech professor (1933–2020) | Czech Medal of Merit (2005), honorary doctorate (2000), honorary doctor of Saint Petersburg State University (2015), honorary

Polish pastor (1929-2008) | Officer of the Order of Polonia Restituta, Badge of the 1000th anniversary of the Polish State, Knight of the Order of Polonia

Pakistani poet and philosopher | Gwadar: April 21, 1926 - Karachi: March 4, 1978 | Syed Zahoor Shah Hashmi | Gwadar: April 21, 1926 - Karachi: March 4, 1978

American physicist who helped build the first atomic bomb | Guggenheim Fellowship (1973), Glenn T. Seaborg Award for Nuclear Chemistry (1975), Guggenheim

Swiss mathematician (1909-1978) | honorary doctor of the Katholieke Universiteit Leuven (1971), Honorary doctorate from the Julius Maximilians University of

Polish Army officer and engineer | Defence Medal 1940–1945, Officer of the Order of Polonia Restituta | Warsaw University of Technology | Łapy: April 21

Dutch chemist (1908-2001) | University of Amsterdam | Amsterdam: April 21, 1908 - Lochem: November 23, 2001 | Jan Ketelaar | Amsterdam: April 21, 1908

Polish chemist | Officer of the Order of Polonia Restituta, Medal of the National Education Commission, Commander of the Order of Polonia Restituta | Adam

Stalin Prize, 2nd degree (1951), Medal "For the Victory over Germany in the Great Patriotic War 1941–1945", Order of the Red Banner of Labour, Miner's

Finnish chemist (1904-1993) | Helsinki: April 21, 1904 - Nurmijärvi: June 26, 1993 | Olli Ant-Wuorinen | Helsinki: April 21, 1904 - Nurmijärvi: June 26, 1993

Dutch mathematician (1904–1964) | Denjoy–Koksma inequality | University of Groningen | Heerenveen: April 21, 1904 - Amsterdam: December 17, 1964 | Jurjen

American mathematician (1903–1990) | Paul R. Halmos - Lester R. Ford Awards (1974) | spline, Myers's theorem | Frederick William University Berlin, Alexandru

mathematician (1902–1994) | Pécs: April 21, 1902 - Budapest: July 1, 1994 | Alfonz Pechan | Pécs: April 21, 1902 - Budapest: July 1, 1994

Spanish professor and chemist (1901-1996) | Grand Cross of the Civil Order of Alfonso X the Wise (1971), Castelao Medal (1991), honorary doctorate of the

Dutch chemist and historian (1900–1973) | Delft University of Technology | Breda: April 21, 1900 - Haarlem: January 13, 1973 | Robert Jacobus Forbes | Breda

Italian inventor and entrepreneur (1897–1967) | Malgrate: April 21, 1897 - Lecco: May 21, 1967 | Pietro Vassena | Malgrate: April 21, 1897 - Lecco: May 21, 1967

Romanian playwright, novelist, philosopher and poet (1894–1957) | University of Bucharest, Gheorghe Lazăr National College | Bucharest: April 21, 1894

President of Peru (1889-1967) | Collar of the Order of Isabella the Catholic (1940), Knight Grand Cross with Collar of the Order of Merit of the Italian

Swiss chemist (1889-1971) | honorary doctorate from the University of Strasbourg (1950), doctor honoris causa from the University of Paris (1938), honorary

German philosopher, jurist and sociologist (1886–1970) | Hanau: April 21, 1886 - Bad Honnef: January 20, 1970 | Carl August Emge | Hanau: April 21, 1886

Karl Troop Cross | Eötvös Loránd University, University of Paris, University of Göttingen | April 21, 1886 - Budapest: August 7, 1955 | Lajos Grosschmid

Russian physicist | Medal "For Valiant Labour in the Great Patriotic War 1941–1945", Medal "In Commemoration of the 800th Anniversary of Moscow", Order of

Russian writer and geologist | Bestuzhev Courses | Saint Petersburg: April 21, 1882 - Saint Petersburg: May 14, 1951 | Vera Kalitskaya - Абрамова

American physicist | Guthrie Lecture (1929), Elliott Cresson Medal (1932), Bingham Medal (1951), Josiah Willard Gibbs Lectureship (1931), doctor honoris causa

Knight of the Order of the Dannebrog (1933) | Ranum Seminarium | April 21, 1882 - Varese: July 16, 2024 | Kort K. Kortsen | April 21, 1882 - Varese: July

Soviet embryologist (1878–1942) | Faculty of Physics and Mathematics of the Saint Petersburg University | Saint Petersburg: April 21, 1878 - Kostroma

German chemist (1875-1951) | Elberfeld: April 21, 1875 - Bonn: March 4, 1951 | Paul Pfeiffer | Elberfeld: April 21, 1875 - Bonn: March 4, 1951

Japanese mathematician (1875–1960) | Person of Cultural Merit (1951), Order of Culture (1940) | blancmange curve, Takagi existence theorem | University of

Chinese philosopher | University of Tsukuba, University of Edinburgh | Changsha County: April 21, 1871 - Beijing: January 17, 1920 | Yang Changji | Changsha

American film pioneer (1870–1941) | Connellsville: April 21, 1870 - New York City: April 30, 1941 | Edwin Stanton Porter | Connellsville: April 21, 1870

German mathematician (1869–1940) | University of Göttingen | Elze: April 21, 1869 - Vienna: May 19, 1940 | Philipp Furtwängler - Friederich Pius Philipp

German sociologist, philosopher, and political economist (1864–1920) | The Religion of China, The Religion of India, Ancient Judaism, General Economic

French physicist | Officer of the Legion of Honour | Paris: April 21, 1861 - Savennières: October 31, 1923 | Arnaud de Gramont | Paris: April 21, 1861

April 21, 1856 - Munich: November 16, 1934 | Birger Stafsing | April 21, 1856 - Munich: November 16, 1934

Brazilian "Condorist" poet, essayist, literary critic, professor and journalist (1851–1914) | Faculdade de Direito do Recife | Lagarto: April 21, 1851 - Rio

British mathematician and physicist (1851–1913) | Fellow of the Royal Society of Edinburgh | University of Edinburgh | Blairgowrie and Rattray: April 21

German philosopher (1848–1936) | Pour le Mérite for Sciences and Arts order | University of Göttingen | Wiesentheid: April 21, 1848 - Berlin: December 25, 1936

Austrian chemist (1847-1928) | Charles University, Ludwig-Maximilian-University in Munich | Prague: April 21, 1847 - Berlin: January 7, 1928 | Richard Pribram

April 21, 1842 - New Haven: August 17, 2004 | Stephen Paschall Sharples | April 21, 1842 - New Haven: August 17, 2004

Scottish-American naturalist (1838–1914) | California Hall of Fame (2006) | My First Summer in the Sierra, A Thousand-Mile Walk to the Gulf, Our National Parks

British businessman | Albourne: April 21, 1831 - Coventry: June 17, 1881 | James Starley | Albourne: April 21, 1831 - Coventry: June 17, 1881

French philosopher and scholar (1830–1902) | Knight of the Legion of Honour (1900) | Nantes: April 21, 1830 - Neuilly-sur-Seine: February 6, 1902 | Clémence

April 21, 1829 - January 1, 1880 | Abram Reese | April 21, 1829 - January 1, 1880

French critic and historian | Concours général (1847), Honorary doctor of the University of Oxford (1871), Officer of the Legion of Honour, Knight of the

German chemist (1827-1909) | University of Göttingen | Eutin: April 21, 1827 - Greifswald: May 13, 1909 | Heinrich Limpricht | Eutin: April 21, 1827

American inventor in film development | National Inventors Hall of Fame (2011) | Union College | Tompkins County: April 21, 1822 - Tompkins County: December 31, 1900

French mathematician (1814–1885) | Knight of the Legion of Honour | April 21, 1814 - January 1, 1885 | Paul Émile Breton de Champ (Paul Emile Breton de

scientist | Jelgava: April 21, 1814 - Kharkiv: April 3, 1882 | Alexander Dellen | Jelgava: April 21, 1814 - Kharkiv: April 3, 1882

German chemist (1812–1894) | University of Kiel | Kiel: April 21, 1812 - Heidelberg: March 18, 1894 | Friedrich Wilhelm Hermann Delffs | Kiel: April 21, 1812

English religious philosopher (1805-1900) | Fellow of the American Academy of Arts and Sciences | Norwich School, Harris Manchester College | Norwich: April

Czech chemist and university educator (1805–1868) | Knight's Cross of the Order of Franz Joseph | Gabrielina Huť: April 21, 1805 - Prague: March 17, 1868

French scientist | Caen: April 21, 1777 - Paris: November 3, 1869 | Pierre-François-Guillaume Boullay (Pierre-Francois-Guillaume Boullay)

French scientist (1774-1862) | Knight of the Legion of Honour (1814), Rumford Medal (1840), Fellow of the American Academy of Arts and Sciences (1822)

American mathematician (1773-1835) | Princeton University | Lamington: April 21, 1773 - Chapel Hill: January 27, 1835 | Joseph Caldwell | Lamington: April 21

British doctor | April 21, 1766 - June 28, 1802 | Thomas Garnett | April 21, 1766 - June 28, 1802

Italian astronomer and physician | Macerata: April 21, 1706 - Rome: July 21, 1776 | Giuseppe Asclepi | Macerata: April 21, 1706 - Rome: July 21, 1776

Leipzig University | April 21, 1686 - Lutherstadt Wittenberg: May 27, 1712 | Johann Christian Hebenstreit | April 21, 1686 - Lutherstadt Wittenberg: May 27, 1712

German physician and chemist | Leipzig: April 21, 1667 - Leipzig: August 4, 1706 | Johann Christian Schamberg | Leipzig: April 21, 1667 - Leipzig: August 4, 1706

French mathematician | Rolle's theorem | Ambert: April 21, 1652 - Paris: November 8, 1719 | Michel Rolle | Ambert: April 21, 1652 - Paris: November 8, 1719

Arab Andalusian Muslim writer and philosopher (1126–1198) | The Incoherence of the Incoherence, Bidayat al-Mujtahid, Colliget, On the Harmony of Religions