Portal:History of science/Selected anniversaries/February 20
- 1762 - Death of Tobias Mayer, German astronomer (b. 1723)
- 1771 - Death of Jean Jacques d'Ortous de Mairan, French geophysicist (b. 1678)
- 1844 - Birth of Ludwig Boltzmann, Austrian physicist (d. 1906)
- 1907 - Death of Henri Moissan, French chemist, Nobel Prize laureate (b. 1852)
- 1909 - Publication of the Futurist Manifesto in the French journal Le Figaro
- 1920 - Birth of Evgeny Dragunov, Russian weapons designer (d. 1991)
- 1972 - Death of Maria Goeppert-Mayer, German physicist, Nobel laureate (b. 1906)
- 1984 - Death of Paul Dirac, British theoretical physicist, Nobel Prize in Physics (b. 1902)
- 2005 - Death of Tom Willmore, English geometer (b. 1919)
- 2007 - Death of F. Albert Cotton, American chemist (b. 1930)