The earliest knives were shaped by knapping (percussive flaking) of rock, particularly harder rocks such as obsidian and flint.
During the Paleolithic era Homo habilis probably made similar tools out of wood, bone, and similar 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. The first metal (copper) knives were symmetrical double
edged daggers, which copied the earlier flint daggers. In Europe the first single edged knives appeared during the middle bronze age.
Modern knives may be made from many different materials such as alloy tool steels, carbon fiber, ceramics, and titanium.
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