Events
1921 – Researchers at the University of Toronto led by biochemist Frederick Banting announce the discovery of the hormone insulin.
Births
1733 – Jeremiah Dixon, English surveyor and astronomer
1833 – Thomas George Bonney, English geologist
1848 – Loránd Eötvös, Hungarian physicist
1881 – Hans Fischer, German chemist, Nobel laureate
Deaths
1844 – John Dalton, English physicist and chemist
1917 – Emil Theodor Kocher, Swiss surgeon, Nobel laureate
1931 – Auguste-Henri Forel, Swiss entomologist