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"so, what's k.f.? and what's etzold?" K. F. is really easy: It stands for Karl-Friedrich which was the first name of the physicist and mathematician Carl-Friedrich Gauss. It actually worked. I was named after him and guess what I became: a physicist. What did not work is usage. My parents, I guess primarily my father, decided that this first name was a bit long, hence the initials K-F which I use for my first name. As for Etzold, well what's a sparrow? K-F