Paul I have been making intermittent efforts to organize my FOTD collection. I just noticed that you have an entry for March 97. Interesting that the reference to Scientific American leads to their current page. I can't find any references on that page to anything but current data. In my opinion this reference should lead to the Aug 1985 issue. I trace my downfall to this issue and I have a copy of it. Could scan it and make it available if there are not any copyright problems. It would be nice if magazines made back issues available. I just acquired the complete National Geographic collection on DVD. Much smaller than their last collection on CD's. I notice that you only have 2 FOTD's for June of 97 on display. Do you want to fill in the rest of them? One note. I have two versions of June 19, 1997. One is the one you have posted and the other has the same picture name , and text file but with a time for a 200 MHZ system with an identical formula but with a different formula name. I have done some editing on the parameter file because the reference to the formula file name is not currently necessary. Charles