Flint (and glass) knapping is no longer practiced on a large scale, but it used to be the primary method of making weapons for primitive cultures. In this day and age of course, it’s easy to go to the sporting goods store and pick up a quality steel knife, but it wasn’t always so.
There are still people out there that practice the art (and I do mean art) of knapping; one such artist created this knife from fiber optic glass, and offers them for sale on his web site. Personally, I doubt I would ever use such a knife for fear of breaking it, but it does make an amazing display piece. If you want one, it’ll cost you $165 – a small price to pay considering the amount of time it must have taken to hand make this knife from a piece of glass. Remember, one mistake, and you have to start over.