For the vast majority of international travelers, a passport is a necessity.
But why?
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For the vast majority of international travelers, a passport is a necessity.
But why?
Learn more about advertising on the HowStuffWorks podcasts at
[www.howstuffworks.com/advertisers.htm](http://www.howstuffworks.com/advertisers.htm)
And to learn about your ad choices when listening to podcasts, visit
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