Would one of you folks please explain to me why a bullet needs 12+ inches of penetration to be useful but a knife only needs a 2 inch blade? Why have military knives been so large all these years? Why are bayonets 8-18 inches long? I understand you can, if you lucky, slice one of the few arteries that are close to the skins surface or you might magically cut a tendon or sever a muscle (not to likely with a 2-3 inch blade) but what is it that YOU know that none of the rest of society doesn't seem to know? Even in prison, a 2-3 inch shank is laughable. Its considered a "sissy shank". Real shanks have blade of at LEAST 6 inches. Most of them are "ice picks" that are meant to puncture the heart, lungs, organs, etc....The only inmates I've seen severely injured by knives were with long blades that caused serious internal injuries. When they fight with the shorter blades they might get DOZENS of cuts that are completely superficial and didn't do ANYTHING to slow them down. "Snitches" will sometimes get cut from chin to ear to mark them as snitches. I've not seen ONE of the many I've seen that got anything worse than a good scar out of it. No severed arteries, trachea, etc..... And don't think these inmates don't have the time to train with these knives. I would consider them VERY accomplished knife fighters. WHY? Because in their minds its about survival and a very REAL skill to have. Its no hypothetical, its REAL so I think we can learn a little from what we see them do. It seems the PRO knife guys in this thread won't address the facts. I don't care what "Gee Whiz" class you took on how to turn your Spyderco superknife into a sword the fact is that "wavy" blade or not, it is still a small knife. The bottom line is a small knife, is NOT a very good weapon to defend yourself a good attacker. It is a WORLD better than bare hands but you need to recognize its limitations. There are cases where you firearm might not be practical, (in a crowd for instance) but its ALWAYS option 2 to me. My first thought would be how I can deploy my REAL weapon. Then after I have decided I can't, the knife might be my only option. But PLEASE stop acting like its a better one. Even a good, heavy, long bladed military knife is not a firearm. A 3 inch folder DEFINITELY is not. I would suggest if you carry a folder, carry a MINIMUM 3 inch blade. Many state won't allow a blade longer than that but if you have the choice of a 3 inch blade, why carry a 2 inch blade? Doesn't make sense to me.