I have noticed that most people don't know this trick. When you are cooking something in a pot and there is a danger of the contents boiling over, just put a wooden spoon across the top of the pot....for really big pots, sometimes two is in order. I have completely stopped using a lid. Been doing this for about 4 years now. I don't know why this works, just that it does....since I have been told this trick I have had nothing spill over. I would be interested to hear anyones explanation as to why this works....or theories?