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Thanks again all for the welcome and advice. I'm a high school science teacher. So with my science background I'm always interested in the "why". All of the historical information is great and has helped a lot. I read through all the "From the Tops" yesterday. Skimming through the yellow manual now. I haven't downloaded the software yet. I need to have a conceptual understanding first before I take that plunge. Ted I'll be sure to search for the post you recommended.
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