When I was a secondary schoolmaster I always considered myself a generalist rather than a subject 'expert', so I was particularly useful to the unfortunate colleague who had to construct the annual school timetable, when he/she found they needed someone to teach a class of, say, history, but didn't have a history specialist to take it. So, over my thirty years in the profession, I took classes of geography, geology, history, English, religious education, personal and social education, information technology, French, maths, general science, and, just the once, thank goodness, girls' netball. Of these I was qualified in only one: geology.
I enjoyed learning in new subject areas, and felt that it was not altogether a bad thing that I approached a subject from the same ignorant view as most of my pupils.
Despite this, I have always had a niggling desire to have been THE world expert on something. I might have become just that when, on leaving university in 1967, I was offered an MSc, the area of research being the Namurian goniatites of the Derbyshire/Staffordshire Peak District, goniatites being a slightly obscure, ancient and long-extinct relative of the ammonites.Had I been able to take history at university - I wasn't, because I didn't even have an 'O'-level in the subject - my research would have been into the development and spread of the lateen sail, seen here on an ngalawa off the Tanzanian coast. I suppose the reason for this interest lay in the fact that I had seen lateen sails through my early life in Tanganyika and Kenya, and because........a lateen sail, seen here on an Omani dhow, has always seemed to me to be exceptionally beautiful.Photos of goniatite and tourmalines courtesy Wikipedia.