It’s a surprising thing to say, but this documentary about how nails are made turns out to be really interesting. It begins with basic blacksmithing techniques and then traces the industrial methods used to produce these everyday items, which come in nearly every size you could think of. The film shows some processes that still rely on manual labor alongside others involving large-scale machinery, giving a clear picture of how vital these metal fasteners are to construction projects everywhere. You can practically feel the heat from the molten metal, and the constant motion of the equipment as it produces them in massive quantities—millions, if not billions. Beyond just nails themselves, this is an impressive exploration of large-scale engineering that goes by quickly; it’s easy to watch for more than ten minutes.

Source on TMDB