Why do you cry when you cut onions?
After cutting into an onion, a chemical chain of events reacts with the cornea to produce tears, but it can be prevented.
Source: http://rss.cnn.com/~r/rss/cnn_health/~3/4O0pfqgGsEI/upwave-why-do-onions-make-you-cry.upwave.html
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