
Crick and Watson's DNA Molecular Model
1953
1953
1953
1956
1955
1839 (original); circa 1988 (replica)
1951
circa 1955
1950
1950
1955
1955
1951
circa 1955
1956
1952
1954
1952
1954
1952
1954
1956
1956
1952
1951
1955
1951
circa 1950
1955
1953
1954
1951
1953
1954
1951
1950-1953
1955
1955
1955
1954
1951
1951
1956
1938 and 1951
1956
May 1953
2000-100 BCE
1950-1951
1953
circa 1950
1955