Would you settle for mind-boggling?
I just realized that I don't know beans about that thing in the payload bay. It's the European Space Agency's Columbus laboratory, but I have absolutely no idea what's inside it. I studied up on the Japanese Experiment Module that will go up late next year because I was helping the Japanese guys very early on in their program--it's as cool as you would expect a high-tech machine from Japan to be--but Columbus is a total mystery to me.