Add Yahoo as a preferred source to see more of our stories on Google. When reheating leftovers, it can be tempting to leave the food in the cardboard box when you pop it in the microwave. Before you ...

French fry container with fries in the microwave - Levent Konuk/Shutterstock When reheating leftovers, it can be tempting to leave the food in the cardboard box when you pop it in the microwave.