I remember being taken into the Genetics department at Edinburgh Uni by my mates and shown some machines which I think were called DNA Sequencers. Apparently, they analysed various DNAs using just four letters A, G, C and T. (My memory isn't THAT good, I've just googled those!) It all came out on very very long rolls of paper (old-fashioned nowadays I expect) with just these letters in never-ending sequences.
I was quite privileged, because I reckon this was in the early days of
modern Genetics. They hadn't started to 'do' the Human Genome yet.

I had a boyfriend in Molecular Biology and took on another from Genetics, later on yet another from Virology. (Very innocent in those days, nothing too naughty!) I had quite scientific tastes in blokes, in spite of being in the Faculty of Arts.