A knife is a sharp-edged instrument consisting of a thin blade used for cutting. The knife can be used as a tool or a weapon. Its origins date as far back as two-and-a-half million years ago, as evidenced by the Oldowan tools. Knives can be sharp or blunt. History The earliest knives were shaped by percussion flaking from rock, particularly water-worn creek cobbles made out of volcanic rock. During the Paleolithic era Homo habilis likely made similar tools out of wood, bone, and similar highly perishable materials that have not survived.As recent as five thousand years ago, as advances in metallurgy progressed, stone, wood, and bone blades were gradually succeeded by copper, bronze, iron, and eventually steel. Modern knives may be made from many different materials such as carbon fiber, ceramics, and titanium.Knives gained prominence during the Middle Ages as one of the

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