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Why does cutting onions make your eyes water ?

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Onions make eye watery is because the onions have amino acid sulfoxides form sulfenic acids which react with the water in your tears to form sulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away.

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This may sound funny but when I peel or cut onions, I wear my sunglasses, it works for me!

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