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Re:Ask HN: Have you been infected by Covid-19? What is it like? by bmn__ on Saturday March 14, 2020 @04:53PM (#22578586)
> was literally insulted on YouTube when I advised to keep water in your mouth while cutting onions to avoid crying

The reaction is unsurprising. Anyone who has ever cut onions gained an understanding that irritating gas (http://enwp.org/Syn-Propanethial-S-oxide) wafts up into the eyes. The hypothesis that water in the mouth is supposed to help runs counter to intuition.

It affords testing. Devise an experiment and let us know the result.

Re:Ask HN: Have you been infected by Covid-19? What is it like? by jmnicolas on Monday March 16, 2020 @10:26AM (#22592972)
I don't need to experiment with it, I'm doing it every time I cut onions and I don't cry anymore. It works.

If you want to try, next time you cut onions put some water in your mouth and keep it there until you've finished cutting.

It will get a bad taste, spit it once you're finished.