This is a joke that my Organic Chemistry Lab professor showed to me in office hours the other day. He said he got it from his Chemistry professor when he was a freshman studying at USC some time ago. Here is the structure. Please guess what you think it is: Fe_____Fe / \ Fe Fe | | Fe Fe \ / Fe----Fe It's a heme, no, no, it's a stop sign made of iron, NO, NO! It's a "FERROUS WHEEL" -- Lyn (smiling at you from UC San Diego :-)
(From the "Rest" of RHF)