Pandipedia entry
Why Onions Make You Cry
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Transcript
Cutting an onion breaks its cells, letting enzymes and sulfur compounds mix.
That reaction makes syn-propanethial S-oxide, a vapor that reaches the eye and stings it.
When it touches the moisture on your eye, your brain tells the tear glands to wash it away.
So onion tears are your eye's quick cleanup reflex.
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