Who Invented the First Knife?

Knives were originally made of flint, rock, bone and obsidian. As of 2014, more modern knives are made from materials such as ceramic, iron, steel, titanium, bronze and copper, and they usually have either a folding or fixed-blade construction. Fixed-blade knives fit inside a sheath, are stronger and do not have moving parts. Folding knives use a pivot that connects the blade to the handle and feature a locking mechanism to prevent accidental opening or injury.