Alfred Hershey

Joseph Mandell and I began by attempting to make chromatography of DNA work.

Physical studies of DNA had, of course, been under way for some years before analysis of virus particles began.

When I began playing around at being a physical chemist, I enjoyed very much doing work on the structure of DNA molecules, something which I would never have dreamed of doing before I started.

It seems likely that most if not all the genetic information in any organism is carried by nucleic acid - usually by DNA, although certain small viruses use RNA as their genetic material.

I went to a doctor and told him I felt normal on acid, that I was a light bulb in a world of moths. That is what the manic state is like.

The basic parts, the start-up molecules, can be supplied in abundance and don't have to be made by some elaborate process. That immediately makes things simpler.