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Dr. Jon LaPook explains how radiation can damage human cells and puts what's happening in Japan in perspective
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Raymond Allen Davis is pardoned in deal to pay "blood money" compensation to victims' families
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If the Fukushima nuclear plant's crisis is not calmed soon, Japan will need more brave volunteers to battle it
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NASA's Scott Kelly, 2 Russian cosmonauts land safely in Kazakhstan after 5 months on Space Station
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As critics call existence of some plants "insanity," industry and administration insist Americans are safe Japan evacuations
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Officials tell CBS stricken plant never totally abandoned, but reports of radiation level peak raise fears
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Even as aid pours in from around the world, nation struggles to manage growing humanitarian crisis
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Raymond Allen Davis is pardoned in deal to pay "blood money" compensation to victims' families
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