Radiation: When to worry

As the public remains nervous about what will happen at Japan's nuclear power plants, it's important to keep in perspective the kinds of radiation that people are exposed to every day, and understand the real risks.FULL STORY | Gupta: Radiation's effects

Source: http://rss.cnn.com/~r/rss/cnn_health/~3/7CM2rl_J0xY/index.html

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