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I've heard the resonance with water explanation is a common misconception: https://physics.stackexchange.com/questions/150128/how-do-mi...

more of an oversimplification. polar bonds interact with EM field of microwave oven.

water is one of many thousands of compounds having polar bonds

That doesn't sound like resonance to me, which is about constructive interference and natural frequencies. So more of an inaccuracy I think.