A blade is the portion of a tool, weapon, or machine with an edge that is designed to cut and/or puncture, stab, slash, chop, slice, thrust, or scrape surfaces or materials. A blade may be made from a flaking stone, such as flint, metal (usually steel), ceramic, or other material. Blades are one of humanity's oldest tools, and continue to be used for combat, food preparation, and other purposes.

https://en.wikipedia.org/wiki/Blade

"Good judgement seeks balance and progress. Lack of it eventually finds imbalance and frustration."
President Eisenhower
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