Gary, Do you use anything to make the micrometeorites adhere to the slide? I think I will try to duplicate what you are doing, but at a lesser scale...that is have slides set up maybe 24 hours at a time and probably not every day. Maybe once I get a rhythm going I'll do it more frequent, but I want to get some confidence in what I'm doing. Once I can see where this info may lead, I'll re-evaluate as to how involved I want to get. George