Chill the onion in the refrigerator before cutting
Use a sharp knife
Cut near a running fan or under a vent
Cut the onion under cold water
Peel the onion under cold water
Leave the root end intact until the end
Cut the onion quickly
Wear onion goggles
Light a candle nearby
Use a very sharp food processor blade
Chew gum while cutting
Breathe through your mouth
Rinse the knife occasionally with cold water