I see your hippopotomonstrosesquipedalianism and raise you a ribulosebisphosphatecarboxylaseoxygenase

As I've mentioned before, my brother Ben also blogs. An editor at Oxford American Dictionaries, he writes about words over at "From A to Zimmer." Not surprisingly, our blogs usually don't overlap. But Ben's latest entry--on very, very long words, has prompted me to pose a question of my own here.