throwing knives: 10 Things I Wish I'd Known Earlier
http://alexisccvz632.bravesites.com/entries/general/20-reasons-you-need-to-stop-stressing-about-knife
Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, or a flexible surface with hard particles, such as sandpaper. Additionally,