Portal:History of science/Selected anniversaries/July 19
- 1838 - Death of Pierre Louis Dulong, French physicist (b. 1785)
- 1894 - Birth of Aleksandr Yakovlevich Khinchin, Russian mathematician (d. 1959)
- 1912 - A meteorite with an estimated mass of 190 kg explodes over the town of Holbrook in Navajo County, Arizona causing approximately 16,000 pieces of debris to rain down on the town
- 1921 - Birth of Rosalyn Yalow, American physicist, Nobel laureate
- 1938 - Birth of Jayant Narlikar, Indian astrophysicist