In my demo bag I carry some soil from Chernobyl, a piece of graphite found at the CP-2/Site A/Red Gate Woods/original Argonne, some mushrooms from Lithuania (post Chernobyl), red Fiestaware, and an old Rolex watch. I ask people to order them by how radioactive they are. Any guesses? Dale Boyce dale@radpro.uchicago.edu I'll post the answers later. Please don't post guesses to radsafe.