PEEDYC, I understand the twin thing all too well. Occasionally when I mention to people I have a twin sister, they will ask (without thinking), "Are you identical?" Usually, I will hitch a thumb in the waistband of my pants, pull out a bit, look down, and say, "Apparently not." Once had a PhD ask me that. I said, "I'm gonna go out on a limb and guess your PhD isn't in biology," to which she replied, "Why, no! English Lit. Why do you ask?" Here's your sign.