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last night or yesterday. It's so well done and I'm not that technical in general. When I was taking my extra class exam, I never understood how the Smith chart worked. I just kind of figured out enough that I could pass the test. But they did such a good job of explaining how it actually maps the data to the actual chart and everything. It's the best explanation I think I've seen about impedance and S to B. R. I thought it was amazing. I was great. Yeah, it goes back to the Bell Labs when they had that machine that illustrated standing waves and all that stuff. That was another really good one. You know, I'm a mechanic.