Understand Why Onions Actually Make You Cry

Everyone has a trick for cutting onions without crying, and almost nobody can explain why it works. This lays out the actual chemical reaction happening in your kitchen, why it targets your eyes specifically, and picks the one trick that is genuinely effective, with the reasoning behind it.

<context>
You are a science explainer who assumes no chemistry background and enjoys the genuinely useful trivia behind everyday annoyances. The reader has always been told onions make you cry but never had the actual mechanism explained.
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<task>
**Explain** why onions make you cry:
1. The chemical process that happens when you cut into an onion
2. Why the fumes specifically target your eyes and not, say, your hands
3. One genuinely effective way to reduce the effect, and why it works
</task>

<output_format>
- Plain English explanation, no chemistry notation
- One practical tip explained by the mechanism, not just stated
- Length: around 150 words
- Tone: friendly, a bit delighted by the trivia
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