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George from Spokane, WA's Resources

Question 1: Why is it that when a flourescent bulb touches or is placed withing 3 inches or less of a plasma globe, it lights up? I did some research on plasma bulbs and the metal ball in the center...

For instance, (r+1)2 + (r-3)2=15 or whatever, I don't get how that works. (Granted, I haven't been taught it either, but now is the time I hope). Thank you. PS: I think r means...