If the terrorists don’t get you, cosmic rays will. Excerpt from the Wall Street Journal:

Though not widely known, in-flight radiation is becoming a growing concern among researchers, crew members and the fliers who have to log thousands of miles a month. On any flight, radiation from stars penetrates the airplane, and experts say repeated exposure may be a health risk, similar to getting too many X-rays. The issue has not only led to changes at some foreign airlines, but prompted the FAA to set up a new radiation Web site. And next year, the U.S. government plans to release findings on the long-term effects on crew members, covering everything from miscarriages to cancer.

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