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What is it in onions that make you cry ?

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When you cut an onion, you break cells, releasing their contents. Amino acid sulfoxides form sulfenic acids. Enzymes that were kept separate now are free to mix with the sulfenic acids to produce propanethiol S-oxide, a volatile sulfur compound that wafts upward toward your eyes. This gas reacts with the water in your tears to form sulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away.

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Are you a scientist? That's a lot of info. Good answer.
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I Just Love Science <3
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We are all like onions. We stink on the inside, and are crusty and flaky on the outside.

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