Infinitesimal radioactive isotopes can be carried along on the breeze, landing unseen on the ground, clothes and skin. These tiny products of nuclear reactions are capable of causing large-scale damage in the body if they make it inside through inhalation, ingestion or even a cut. And many fear that such isotopes spewed from the damaged Fukushima Daiichi nuclear plant are traveling inter-continentally--and in higher quantities than Japanese officials are reporting
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