Lawson almost burned the house down!

This morning I was sitting in the livingroom preparing Chloe's reading lesson and Lawson wanted another oatmeal-to-go bar that we had for breakfast. I told him he could and he went to the kitchen to heat it in the microwave. Lawson and Grace have become very good at using the microwave and can even reach it (it is a built-in microwave over the stove). He knows to open the bag and put it in for 10 seconds. I guess he was eager because he hit the 1 button twice and the 0 button twice! He came running into the livingroom and told me "I set the wrong time on the microwave!" I said "Just push cancel or open the microwave door." He ran back in the kitchen and the yelled "I think you should see this!" But I could already see the thick smoke pouring out of the kitchen! I ran in there and stopped the microwave. Before I even opened the door there was thick smoke pouring out of the microwave and even the tops of the cupboards! I opened the microwave and then despite the fact that it was 16 degrees outside I opened all the doors and windows on the first floor of the house. I told the kids to go upstairs and close all the doors. I aired the house out for two hours and it still smells awful! And the weird part is the smoke alarm didn't go off. It goes off every time I make bacon but not when we have a real emergency!