7. André Boivin (left) discusses with Joshua Lederberg at the 1947 Cold Spring Harbor Symposium.
8. Salvador Luria (standing) and Max Delbrück at Cold Spring Harbor, 1953.
9. Leo Szilárd (left) and Al Hershey in the rain at the Cold Spring Harbor Symposium, 1951. They look like characters in a film by the Coen Brothers.
10. Team photo of Al Hershey’s laboratory at Cold Spring Harbor, 1952. Martha Chase is second from the left, Hershey is standing next to her.
11. Rosalind Franklin on holiday in Tuscany, 1950.
12. Maurice Wilkins with an X-ray crystallography apparatus in the 1950s.
13. Jim Watson describes the double helix structure of DNA in the heat of the June 1953 Cold Spring Harbor Symposium.
14. Watson and Crick with the double helix, photographed by Antony Barrington Brown, in May 1953 in their office at the Cavendish Laboratory in Cambridge. The photograph was not published at the time.
15. One of many letters sent by George Gamow. In this letter to Linus Pauling, written in November 1953, Gamow explains his ‘diamond’ model of the genetic code.
16/17. The RNA Tie Club in the 1950s. Right: George Gamow, wearing his Club tie and tie-pin. Below, left to right: Francis Crick, Alexander Rich, Leslie Orgel and Jim Watson in 1955. Orgel was apparently not playing the game – he was not wearing his RNA Club tie.
18. Heinrich Matthaei (left) and Marshall Nirenberg, 1961, after they had cracked the genetic code.