 Number one, try chilling the onion before you cut it in the fridge, freezer, or a bowl of ice water just for a couple of minutes. Or microwave it for 30 seconds or so as long as you're using it for something that doesn't require it to stay crispy. Number two, if you won't mess up the flavor of what you're cooking, squeeze a lemon on the onion before you cut it. And number three, break out a fan to blow the air in front of you away from your face. I'm Dr. Sanjay Gupta, helping you live a better life.