1663 — Robert Hooke saw cells in cork using a microscope.
Charles R. Darwin and Alfred Wallace independently proposed a theory of biological evolution
1869 — Friedrich Miescher discovered nucleic acids in the nuclei of cells.
1945 — Dorothy Crowfoot Hodgkin discovered the three-dimensional structure of penicillin.
1958 — John Gurdon used nuclear transplantation to clone an African Clawed Frog; first cloning of a vertebrate using a nucleus from a fully differentiated adult cell.
1995 — Publication of the first complete genome of a free-living organism.
1996 — Dolly the sheep was first clone of an adult mammal
in 300 BC — Herophilos dissected the human body
350 BC — Aristotle attempted a comprehensive classification of animals
520 B.C Alcmaeon of Croton distinguished veins from arteries and discovered the optic nerve.
