Births
1750 - Déodat Gratet de Dolomieu, French geologist
1894 - Alfred Kinsey, American entomologist and sexologist
1912 - Alan Turing, English mathematician
Deaths
1806 - Mathurin Jacques Brisson, French naturalist
1832 - James Hall, Scottish geologist
1891 - Wilhelm Eduard Weber, German physicist
2006 - Harriet, a 175 year old tortoise perhaps collected by Charles Darwin in 1835.