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Talking Points: Dark lightning, fake wine, PCs

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What is dark lightning? About 260 years after Ben Franklin flew a kite in a storm, scientists are researching a new kind of lightning, dark lightning, which occurs at the same altitudes used by commercial airlines and which may be blasting those planes with gamma rays. The dose of radiation is small, though researchers said they still have to figure out how often dark lightening occurs and what...

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