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Have you ever wondered why cutting an onion often leaves your eyes feeling stingy and teary? It happens because of a fascinating chemical reaction that occurs inside the onion’s cells. When you slice into an onion, you break open its protective layers, releasing a special type of enzyme that mixes with sulfur compounds stored within the vegetable. This combination creates a tiny, invisible gas that quickly wafts upward toward your face. As soon as this gas reaches the moisture in your eyes, it transforms into a very mild acid. Your brain immediately senses this irritation and signals your tear ducts to produce extra water to flush the acid away, which is why your eyes start watering as a natural defense mechanism to keep them clean, safe, and comfortable.