Somewhere, I think at the beginning of a chapter in one of those post-apocalyptic survival novels like "Atlas Shrugged" or "Lucifer's Hammer", there's a description of the most basic real metal tool with which (at least theoretically speaking) all other tools can be made. It might be a hammer, or it might be a file. I can't remember. Anway, I'd give somebody an original authentic "beany copter" (if I had one) to know the exact reference for that description.

Thank you.