Ever since the dawn of time, man has needed to stab things and then cut them into little pieces in order to hasten ingestion for the purpose of nourishment. Enter the knife, a handled tool with a sharpened stone or metal blade good for both stabbing and cutting (and the occasion circus trick). Man and knife have come a long way over the millennia, from hunting down saber-toothed tigers to savoring every bite of a medium-rare Kobe beef tenderloin with dignity and class.