I would add the fun fact that the applied physics work that Crick was doing was experimental work in fluid mechanics when a bomb fell through the roof of his la

I would add the fun fact that the applied physics work that Crick was doing was experimental work in fluid mechanics when a bomb fell through the roof of his laboratory and destroyed his experiment! This was certainly a factor in prompting his to switch fields. I would also add Max Delbruck to your list of turn of the last century physicists cum molecular biologists and the physicist members of the RNA tie club: http://en.wikipedia.org/wiki/RNA_Tie_Club http://en.wikipedia.org/wiki/RNA_Tie_Club. I also have a question for the GP. What exactly makes a physicist so? I have "merely" a masters degree in physics, and although I consider myself to be a theoretical biologist, I am often called a physicist by my collaborators (some of whom are physicists themselves). What about a degree actually matters in this descriptive title?