syn-propanethial-S-oxide http://www.loc.gov/rr/scitech/mysteries/onion.html Everyday Mysteries syn-propanethial-S-oxide chemical irritant Everyday Mysteries Library of Congress chemical irritant Why does chopping an onion make you cry? Library of Congress web page. Library of Congress Everyday Mysteries Everyday Mysteries http://www.loc.gov/rr/scitech/mysteries/onion.html the inevitable tears Everyday Mysteries Why does chopping an onion make you cry? this article onion mystery facts https://www.loc.gov/rr/scitech/mysteries/onion.html https://www.loc.gov/rr/scitech/mysteries/onion.html sulfóxido de tiopropanal the inevitable tears Everyday Mysteries chemical irritant Library of Congress damages its cells syn-propanethial-S-oxide According to the Library of Congress chemical irritant Everyday Mysteries Library of Congress Everyday Mysteries is well known the inevitable tears onion mystery facts Why does chopping an onion make you cry? Everyday Mysteries ಇಮಾನಿಯವರಿಗೆ fumes are released that irritate the eyes