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Home cooks probably know what can be heated in a microwave oven. But do you know what can’t? Well, for one thing, don’t put anything metal in the microwave, warns Wendy Treinen of GE Appliances. That’s her No. 1 no-no. I learned this the hard way. In the 1980s, my Catholic girls high school didn’t have a kitchen, just a row of vending machines and a microwave that did more smoking than some of the…
