Why do onions make us cry?
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Onions make us cry because they release a compound called syn-propanethial-S-oxide when they are cut, chopped, or otherwise damaged. This compound is a type of sulfur-containing molecule that is volatile, meaning it easily evaporates into the air. When syn-propanethial-S-oxide comes into contact with the moisture in our eyes, it forms sulfuric acid, which irritates the eyes and triggers a burning or stinging sensation.
To protect our eyes from potential harm, our tear glands produce tears in response to this irritation. These tears help dilute and wash away the irritant, thus reducing the discomfort caused by the sulfuric acid. This natural response is why we experience tearing when cutting or handling onions.
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