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Message: <blockquote data-quote="Thatgreek/mexicanguy" data-source="post: 2032224" data-attributes="member: 725437">Because microwaves give off waves to heat the food. And anything metal will reflect it.  It'll just bounce off the metal (including foil)  Basically you'll see sparks and hear loud noises and can start a fire.Microwaves work by moving the water molecules really fast in w/e you're heating (which is why beans (have no water) don't cook in the microwave well.) All the molecules moving really fast start to cause friction and heat thus cooking the food.</blockquote>