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Machining, informally as a primer to my coworkers. We have a mill and a lathe at our shop and not very many folks know how to use them or what they can do. I'm mostly self taught so I try to impart some baseline theory and explicit safety warnings while hopefully imparting a small amount of what I find so compelling about the process of machining.
Of course half the time I go through the shpiel, everyone seems excited and then they have to drill a shit ton of holes and realize that machining isn't magic and sometimes it's boring. But every once in a while someone gets an inkling of how cool it is so it's worth it.