Lots to like this week. Favourites included rossim @3, dorrien @9 (after Googling Rohinton!), ixion @15 and 29, ginge @17, paul @39 and FJ @41.
However, as it was specially for me, I must go with
paul @28
(In my last year of teaching the cis/trans nomenclature was largely - though not completely - replaced with E-Z nomenclature. I never got to grips with it!)