Summary
When you cut an onion, cells burst and sulfur compounds go airborne. They react at your eyes to form a mild acid—tears are your eyes washing themselves clean.
The moment you start chopping onions, your eyes protest like a deal was broken. It’s not emotion—it’s a tiny chemistry lab triggered by a blade.\n\nWhen onion cells are cut, their contents mix and form volatile compounds that rise into the air. When these meet the moisture in your eyes, mild irritants form, and your eyes produce tears to wash them away.\n\nSurprising detail: a sharper knife can mean fewer tears. Cleaner cuts crush cells less, releasing fewer chemicals—technique changes the outcome.\n\nIt matters because science is at work even in the kitchen. A tear drop is your body’s fast, automatic cleaning defense in action.
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