> our skin stops quite a bit of radiation of > some types (gamma rays? I think). no, is't Alpha particles that are stopped by almost any layer, but are (consequently) devastating when they hit a living cell directly. Otherwise: I don't doubt there are lots of people on this list on both sides of this discussion, and with convincing arguments, and a pressing urge to convince their opponents (I match the first two criteria, no longer the last). But I think it is for the good of this list when they would do so elsewhere. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist