1753: Carolous linnaeus publishes the first of two volumes containing the classificatoin of all know species.
1859:Charles Darwin suggets that natrual selection is a mechanism of evolution.
1905:Nettie Stevens describes how sex is determined by the x and y chromosomes.
1930:The planet Pluto was discovered.
1951:Rosalind Franklin photographs DNA.
1953:James Watson and Francis Crik figue out the structure DNA.
2000:The human Genome project has identifed thousands of human genes.