Simply because Stainless steel does not rust, which is steel coated with an alloy, usually nickel, it therefor is also not magnetic. and why wouldn't he short out? all wires are encased in rubber or plastic sheathing, and it would only take a minimum amount of silicon around connections, circuit boards to waterproof, that's why your pool pump or washing machine does not short out as well. common practice since the 1930s, nothing futuristic high tech or unreal actually. The question I would ask, what powers him? what generates the current so he can function, there is no extension cord on him, maybe there were batteries, which back then would not last long at all, and would need re charging very often., but it doesn't matte as it's science "FICTION" no reality anyways.
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