Blade steel and its study is really fascinating to me, though not at all related to my professional work. But I became fascinated a couple of decades ago by the

Blade steel and its study is really fascinating to me, though not at all related to my professional work. But I became fascinated a couple of decades ago by the manufacture of khukuris[1] in Nepal, which are often made of salvaged leaf springs from German-made lorries. (Well, I end up working the Nepali language professionally, if not khukuris.) [1] https://en.wikipedia.org/wiki/Kukri https://en.wikipedia.org/wiki/Kukri