On Sep 5, 2005, at 3:22 AM, Russell McMahon wrote: > Many natural events have a certain statistical probability of > occurrence based on relevant factors BUT the probability of occurrence > is largely or totally unaffected by the recent past history. Actually, I don't think we have a very good understanding of where assorted "natural" events fall on the statistical vs periodic vs chaotic scale (thus some of the debate about global warming, for instance...) BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist