I travel a lot -- more than 20 countries last year alone--and that means a lot of time on airplanes. I always worry, because there's a good chance that when I land I'll have the sniffles or something worse. When I started looking into the health risks of air travel, I discovered that a lot of people--as many as 70% of travelers--are just like me. They disembark complaining of everything from earaches and motion sickness to viral infections and dehydration made more severe by the dry air that circulates in airplane cabins.
But the most serious risk to air travel is...
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