The nuclear disaster in Japan has left many people in danger of exposure to radiation and radioactivity. Some are simply fearful. What exactly is this radiation? And what threat does it pose? Weve got some answers below.What is radiation?Radiation has become a frightening word, but theres not necessarily anything dangerous about it. Visible light is radiation. Heat is radiation. Many news channels say that explosions or meltdowns leak radiation into the atmosphere, but few say what exactly this radiation is.

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