R&D in knives has been pretty slow for the past few thousand years. This year a company called Wasp announced a new weapon that is leaps and bounds beyond the knives, you, me, and the cavemen were familiar with. The Wasp Knife has a cartridge of compressed air in the handle, when the knife is pressed into tissue the air is forced through the tip of the blade into the body of the victim. The instant balloon of air causes major ruptures which are pretty damn devastating. Enough talk, check it.