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Microwave

[wireman]

From:http://www.fsis.usda.gov/FactSheets/Microwave_Ovens_and_Food_Safety/index.asp#3

Do microwaves cook food from the inside out?

No. Microwaves penetrate the food to a depth of 1 to 1½ inches. In thicker pieces of food, the microwaves don't reach the center. That area would cook by conduction of heat from the outer areas of the food into the middle.