A knife is a simple yet highly effective technology designed for the task of incising or shearing materials. Fundamentally, its operation relies on concentrating mechanical force along a meticulously shaped edge, allowing it to overcome the cohesive strength of a substrate. The scientific design of such implements focuses heavily on material science, requiring a combination of extreme hardness, edge retention, and structural rigidity. Historically, materials ranged from flaked stone to various metals, progressing to advanced hardened alloys that maintain a fine edge geometry. The efficiency of the cutting action is determined by the blade's cross-sectional geometry and the angle of the bevel, which dictate how efficiently the applied force generates localized stress that exceeds the tensile strength of the target material.