Twin: Nonionizing Radiation
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Nonionizing radiation, like visible light and microwaves, carries too little energy per photon to remove an electron, so its main effect is heating.
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Microwave radiation speeds up water molecules' motion, heating food, without ejecting any electrons from those molecules.
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"Nonionizing" does not mean harmless in any amount — enough of it causes real thermal damage, as sunburn and microwave heat injury show.
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