Yes, there are a few of them. They each have their own particular interests, methods, goals, etc. There is an interesting history of these kinds of folks — there will be a section on them in my (someday finished) books!
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Easy to draw it up on paper. Building it is a whole different beast.
Of course. Though I suspect my undergraduate engineers could manage a gun-type weapon if they had the materials. (Taylor's big argument was that it wasn't "secrets" that were keeping terrorists from such weapons, but material safeguards. But that often got missed.)
