When you cut an onion, you break open thousands of cells that release a chemical which turns into a gas; this gas reaches your eyes and reacts with the water on them to form a mild acid, causing your eyes to flood with tears as a defense mechanism to wash out the irritant.
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You're Not Crying. The Onion Is Attacking You. ๐ง
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You're not crying. The onion is attacking you. When you cut into an onion, you break open thousands of cells. They release a chemical that turns into a gas. That gas reaches your eyes and reacts with the water on them to form a mild acid. Your eyes detect an attack and flood with tears to wash it out. The onion is trying to stop you from eating it.
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