Staring into one of the aquarium’s exhibits “I like these new Mastigias jellyfish”, I said, absently. “Sea jelly”, my colleague corrected (with a certain smugness, I might add). “I beg your pardon?” I replied. “Sea jelly. They’re sea jellies now.” “Oh, are they?” “Yes, like sea stars.” “I’m sorry?” “Sea stars.” “Jellyfish are like sea . . . → Read More: On common names