Q&A: Worries outweigh radiation threats in U.S.

All that worrying might cause more harm than the radiation from the Japan nuclear accident, experts say. A look at some common concerns.With reports that a radiation plume from the Fukushima Daiichi nuclear plant could reach Southern California as soon as Friday, worried citizens have been hoarding potassium iodide pills, wondering if it's OK to go outside and otherwise fretting over an invisible, and somewhat unpredictable, threat.

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