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This article discusses the engineering behind the grooves in chocolate bars. The grooves are not just decorative, but serve a purpose in making it easier to break off a piece of chocolate. The grooves create areas of stress concentration, allowing the chocolate to break at the bottom of the valley with minimal effort. This engineered weakness is what gives chocolate its satisfying "snap" sound. The article also highlights the importance of weaknesses in various everyday objects, such as plastic sachets, candy bar wrappers, and crumple zones in cars, as they allow for controlled strength and functionality. [Extracted from the article]