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Science

How do onions make your eyes water?

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ANSWER

Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears.

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When you cut onions, they produce a chemical irritant known as syn-propanethial-S-oxide. It stimulates our eyes lachrymal glands which then produce tears.

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