why onion make you cry
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Because they contain a chemical that stimulates the eyes' lachrymal glands so they release tears.
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Onions contain compounds like amino acid sulfoxides. As the knife slices through the poor onion, it tears through its cells, releasing its contents like the powerful sulphur compounds. Certain enzymes present in the cell are also released. The gaseous compound starts wafting towards the eyes. The volatile gas reacts with the water of the eye and forms sulphuric acid (mild). The acid is responsible for the irritation and the burning sensation. When this happens, the brain immediately activates the lachrymal glands. The tear ducts work overtime in order to get rid of and flush out the irritant from the eyes.
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