Events
1839 - John Herschel takes the first glass plate photograph.
Births
1737 - Luigi Galvani, Italian physician and physicist
1922 - Hans Georg Dehmelt, German-born physicist and Nobel laureate
1923 - Daniel Carleton Gajdusek, American virologist and Nobel laureate
Deaths
1841 - A. P. de Candolle, Swiss botanist
1941 - Hans Spemann, German embryologist and Nobel laureate
1985 - Paul Flory, American chemist and Nobel laureate
2003 - Edward Teller, Hungarian-born physicist