Portal:History of science/Selected anniversaries/July 28
- 1818 - Death of Gaspard Monge, French mathematician (b. 1746)
- 1867 - Birth of Charles Dillon Perrine, American-born astronomer (d. 1951)
- 1869 - Death of Jan Evangelista Purkyně, Czech anatomist (b. 1787)
- 1915 - Birth of Charles Townes, American physicist, Nobel laureate
- 1925 - Birth of Baruch S. Blumberg, American scientist, Nobel laureate
- 1968 - Death of Otto Hahn, German chemist, Nobel laureate (b. 1879)
- 1996 - Kennewick Man, the remains of a prehistoric man, is discovered near Kennewick, Washington
- 2000 - Death of Abraham Pais, Dutch-born American physicist and historian (b. 1918)
- 2002 - Death of Archer John Porter Martin, English chemist, Nobel laureate (b. 1910)
- 2004 - Death of Francis Crick, English molecular biologist, Nobel laureate (b. 1916)