In the 1970s, I did a Ph.D. with Fred Sanger in Cambridge who was in the process of inventing ways to map what's inside DNA. He later won the Nobel Prize.
I decided I wanted to go to Cambridge, and then I got introduced to Fred Sanger. I was very conscientious, and I asked him when I first got there if I should start reading up on things. But he said, 'No, I think you can just start these experiments,' so I plunged right in.