Metals will cause sparks in microwaves, instead of heating. This is because metals like to give away electrons, so when the microwaves "push" at their magnet-like electrons, instead of turning, they just give the electrons away. A bunch of electrons running off of metal is called electricity, and we see it in the form of sparks. Dry foods like ramen will sometimes burn and start fires in microwave ovens if water is not used with the food.= = = Cobalt = = =
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