Why do we cry when we cut onions?

Ending up in tears when preparing a dish with onions can be pretty darn inconvenient. No sooner have you started chopping them up, you find your eyes getting watery and stinging. Of course, those tears aren’t related to any feelings of sadness; rather they’re down to a series of chemical reactions. Like a lot of fruit and veg we buy at the supermarket, onio ... Show More