The "Culprit" Which Makes Me Cry (part 2 )why slicing onion makes us teary-eyed

I wrote earlier about my “crying episode” while slicing the onion.

I’ve read that a chemical irritant (syn-propanethial-S-oxide) is produced when onions are chopped or sliced .This stimulates the glands which release tears. Another recent discovery proved that lachrymatory-factor is the chemical irritant. Whatever, slicing onion makes us cry because of that "something" that has been released when onion is being cut or sliced.

Some tips which help in slicing or chopping onions that don’t irritate our tear ducts:

•  slice the onion near the sink while the water is flowing from the tap (put some container for flowing  water so as not to waste).
• slice the onion in two and slice it upside down so the enzyme's release will be minimized