Why do our eyes burn and tear when we cut onions? This listener question will be discussed in this episode. I can now be reached on twitter under @ChemistryinEve1 , if you have feedback that you would like to share. Alternatively, you can send an email to [email protected] . Sources https://en.wikipedia.org/wiki/Tear_gas https://de.wikipedia.org/wiki/Reizstoff https://de.wikipedia.org/wiki/Zwiebel https://en.wikipedia.org/wiki/Onion https://en.wikipedia.org/wiki/Syn-Propanethial-S-oxide https://de.wikipedia.org/wiki/Propanthialoxid https://www.britannica.com/story/why-do-onions-make-you-cry https://www.thoughtco.com/why-do-onions-make-you-cry-604309 https://www.sciencedaily.com/releases/2017/06/170620122950.htm http://www.chm.bris.ac.uk/motm/pso/psoc.htm https://en.wikipedia.org/wiki/Alliinase https://en.wikipedia.org/wiki/Alliin https://en.wikipedia.org/wiki/Cysteine#Biological_functions