Different viral species contain nucleic acids that differ not only in length and nucleotide sequence but in many unexpected ways as well.

That's the nice thing about doing research. Whatever you do is novel, so you always have this sense of novelty, even if you are only using a new gadget.

Blooks differ from books in several ways

I consider that there are different degrees of civilization and there are many different ways of expressing it. But one is civilized or is not.

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.

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